Article 63 – ‘Unseen enemies’ Part 2

Hi, and welcome to Taiga Bonzai, in this post we continue our journey trying to make sense of mankind’s actions both past and present and the consequences that have happened and those that will inevitably occur at some future juncture; it is not a question of if – it is a question of when.

Introduction – In part 1. of this series we discussed the appearance of bacteria, microorganisms and plant life, the dinosaur era to early mankind, trade via the silk road, pests and disease, the Justinian plague, rules and restrictions. In this article we reveal some of the effects of mankind’s blunderous decisions.

The Microbe – as we have stated science has told us that microorganisms can exist in a single-cell form or a colony like bacteria and fungi and although they are often associated with dirt and disease, most microbes are beneficial. But as we are aware there exist those microbes, fungi and pathogens that have lethal potential as the inhabitants of Guanahaní (San Salvador) found to their cost courtesy of Christopher Columbus and his entourage when they arrived there on 12th of October 1492; the result human infectious diseases, mayhem and death. Evidence shows that mankind has shaped the world in his own volition, but in reality the outcome is questionable.

The stowaways – another example of man’s irresponsible behaviour – on December 7th 1941 at 7:55 a.m. (Hawaii time) the Imperial Japanese Navy under the command of Admiral Isoroku Yamamoto attacked the American naval base at Pearl harbour and according to Gill, G. Hermon (Royal Australian Navy 1939–1942. ‘Australia in the War of 1939–1945’. Series 2) “Over the course of seven hours there were coordinated attacks on the U.S. held Philippines, Guam and Wake islands and on the British territories in Malaya, Singapore and Hong Kong.” This prompted the Americans and British to step up military armament production as further confrontation on the territories of Australia and New Zealand was deemed imminent.

As armament production increased it was packed in wooden crates and transported to the docks where it stayed prior to being loaded on to transport ships, during this inactive period many insect species entered the crates possibly to find shelter; once the crates reached their destinations and were unloaded the insects were free to wander. In 1945, the first wasp Vespula germanica endemic to the Northern Hemisphere was discovered at an air force base near Hamilton in New Zealand; it has been suggested that a hibernating queen had arrived in a crate containing aircraft parts from Europe.

Vespula germanica

V. germanica was also found in Tasmania in 1959 and by 1978 had crossed the Tasman Sea and entered Australia, now countless colonies are common place in Victoria, South Australia, New South Wales and Western Australia. V. germanica nest in cavities that include holes in the ground, spaces under homes, wall crevices, eaves and rafters. This predator having no known enemies attacks bee hives, a major problem for the Australian and New Zealand honey industry and if provoked will attack all including humans with devastating results.

According to Elle Hunt in her article for ‘The Guardian’ (Jan 17th 2017) analysis shows that “Australia’s bees and wasps revealed to be as dangerous as its snakes, more than half of deaths from bites and stings between 2000 and 2013 were the result of anaphylactic shock.” Was the introduction of V.germanica to Australia and New Zealand a simple mistake or a blatant error of judgement? Whatever the arguments the consequences are dire these two countries have a major problem on their hands. Similarly much can be said of other nations whom transport their merchandise around the globe with the same complacent attitude.

The invaders – Borers are perhaps the most harmful to trees, The Asian Longhorned beetle Anoplophora glabripennis native to eastern China, and Korea has been introduced into the United States, where it was first discovered in 1996, and in Canada and several countries in Europe including, Austria, France, Germany, Italy and UK. This beetle is believed to have been spread from Asia in solid wood packaging material. A. glabripennis primarily infest maple, poplar, willow, and elm trees. In the United States it has attacked birch, katsura, ash, planes and Sorbus; In Canada on maple, birch, poplar and willow and in Europe on maple, alder, birch, hornbeam, beech, ash, planes, poplar, Prunus, willow and Sorbus.

The Bronze Birch borer Agrilus anxius is a wood-boring Buprestid beetle native to North America numerous in warmer parts of the continent where it thrives. It is a serious pest on birch trees Betula frequently killing them and if this insect came to Europe there would be no hope for Birch forests as the trees have no resistance against this species of insect; hence the effect on Scandinavia’s Birch industry would be catastrophic.

The Bronze Birch borer

The Emerald Ash Borer Agrilus planipennis, a devastating alien pest of ash trees was first detected in Europe in Moscow in 2003. Its outbreak in the cities of European Russia seriously damaged plantations of Ash trees Fraxinus pennsylvanica introduced from North America. This alien pest posing a major threat to ash trees all over Europe has spread to Ukraine and the south of European Russia and severely damages the green ash F. pennsylvanica; research indicates that will appear in other European countries soon with the potential to destroy F. pennsylvanica plantations.

Emerald Ash borer

The Chinese emerald ash borer found its way to America via international shipping, when it gained its freedom it was greeted with a fresh new smorgasbord of North American ash trees Fraxinus americana, thus making itself a new home in which to reside. To date the amount of devastation to millions of ash trees is now in the tens of millions across 25 states.

Airborne invasion – We know that many pests and disease have migrated throughout the world by conventional methods, in the packaging containing merchandise and sometimes in the merchandise itself; mainly via land sea and air. However, these modes of transportation is not the only way for pests and disease to migrate to other realms. There are those whom are able to take to the wing and reach altitudes of 2,000m some actually fly, whilst other drift on the air currents. For example, the Desert Locust Schistocerca gregaria a periodically swarming, short-horned grasshopper from Africa destroys thousands of hectares of crops on its migration eastwards, these pests can easily reach and altitude of 2,000m and cover a distance of up to 200 km in a single day.

Those that tend to drift on the air currents and travel vast distances include pathogens that are microscopic, the average size of most bacteria is between 0.2 and 2.0 micrometer, (diameter) – fungal spores typically range in size from 2 to 50 μm in diameter, with most allergenic spores in the respirable size range of 3 to 10 μm. Such pathogens when earthbound are able to create their own colonies if conditions allow and can attack vulnerable vegetation including food crops, flowering/fruiting plants and trees; at this juncture methods of control are inadequate. The old adage that ‘Prevention is better than cure’ is meaningful, but the devastation of ‘unseen enemies’ only becomes visible when it is too late to react.

Sirex noctilio

Sirex woodwasp (Sirex noctilio) a species of horntail native to Europe, Asia, and North Africa is an invasive species in other realms including Australia, New Zealand, North and South America and South Africa where it has become a significant economic pest of pine trees especially Pinus radiata. The wasp can attack a wide variety of pine species, although some species seem to be more susceptible than others and stressed trees often are attacked. It is believed that this insect was introduced on unprocessed pine logs imported from Europe.

P. radiata were first planted in the late nineteenth century in Australia, Chile, New Zealand and in South Africa during the early 1900’s, their excellent growth provided the basis for thriving lumber and paper industries. During 1920’s and 30’s the lumber industry stagnated because the demand for small logs from thinning operations decreased, hence thinning ceased which made plantations susceptible to S. noctilio and its associated fungus, Amylostereum areolatum. By 1947, high levels of tree mortality were occurring, primarily in the un-thinned plantations causing devastation to the lumber and paper industries.

Adult sirex woodwasps vary in size from 9 to 36 mm (0.35 to 1.42 in), during oviposition the female will lays 2 eggs often with a mucoid substance and a symbiotic fungus to feed on once hatched. This mucoid substance is toxic to trees as are the ascospores from symbiotic fungus Amylostereum areolatum a species of crust fungus originally called Thelephora areolata, it was given its current name by French mycologist Jacques Boidin in 1958.

The hidden menace – Dutch elm disease (DED) first appeared in the north-west of Europe about 1910 and between 1914 and 1919, several Dutch scientists carried out influential research on the cause of the disease. According to https://www.forestresearch.gov.uk this disease “Is one of the most serious tree diseases in the world.” The fungus that causes the disease is spread by bark beetles triggering foliage and tip dieback in all of Britain’s native elms: English elm Ulmus procera, smooth-leaved elm U. carpinifolia and wych elm U. glabra. The disease first spread to Britain in the 1920s, where it killed 10-40% of elm trees. Although the initial epidemic died down, a more aggressive species of Dutch elm disease fungus was accidentally introduced into Britain in the 1960s.

Hylurgopinus rufipes Scolytus schevyrewi Scolytus multistriatus

A second epidemic took hold of lowland central and southern Britain where there were English elms in the early to mid-1970s and by 1980, most mature English elms had died. Scattered pockets of mature elm occasionally survived where the geographic situation has facilitated an effective and continuing sanitation control programme. By the late 1980s the bark beetles used up most of the mature elms that they relied on for breeding material, so beetle populations declined and the disease virtually disappeared from many southern and south-western areas.

In 1982, Forestry Commission research on the biology of Ophiostoma novo-ulmi, an extremely virulent species from Japan has devastated elms in Europe, North America, Asia and now is spreading across across Eastern Europe. (Romania to Poland) This suggested that the disease would not decline in intensity or contrast to the first epidemic, caused by O. ulmi. The new pathogen, O. novo-ulmi, would return in a continuing cycle to attack the following generation of small elms once they were large enough to support beetle breeding.

Cryphonectria parasitica a pathogenic fungus a member of the Ascomycota (sac fungi) native to East Asia and south-east Asia was introduced into Europe and North America in the early 1900s spreading rapidly causing significant tree loss in both regions. This disease came to be known as ‘chestnut blight’ due its infestation of Chestnut trees (Castanea dentata) and has had a devastating economic and social impact on communities in the eastern United States. Once a tree begins to decline it is often dead within a few years and eradication efforts by cutting and burning the infected plants/trees have mostly failed; at this present juncture there are no chemical management options for control.

Chestnut Harvesting

Thus far the consequences of mankind’s actions over the millenia do not paint a good picture, in fact the problems we have tried to solve many of which we cannot are only increasing at an alarming rate. As stated there are no chemical management options for control, should we concentrate our efforts to find more potent solutions to eradicate pests and disease; we have already tried this approach see article 56 ‘Bug apocalypse’. In part 3 of this series we continue the journey uncovering more catastrophic failures, until next time, BW, Nik.

Article 62 – ‘Unseen enemies’ Part 1

Hi, and welcome to Taiga Bonzai in article 56 ‘Bug apocalypse’ we discussed a topic that was hot news to many horticulturists and conservationists at the time re: the continuing decline in insect population that is causing great concern as they are vital to our survival.

Introduction – this 4 part series ‘Unseen enemies’ discusses an even bigger issue – the increasing problem of pests and disease that is devastating the world’s tree and crop plantations and the ultimate effect on society. How this phenomenon occurred is the result of mankind’s actions. Since the dawn of time these actions have caused catastrophic consequences in many ways, now the world is facing unprecedented challenges that will be extremely difficult to resolve. Have we reached the point of no return – some believe that we have past it whilst others are more complacent, ‘yes these situations need to be addressed but they can be resolved’; but can they?

During our travels around the globe we have been privy to some extraordinary and amazing locations, returning to them at a later date we note that many have been destroyed – piles of rubble, barren land, some are now heavily polluted – rife with pestilence and disease. Such experiences do not wane, they remain strong and clear in the mind. How have we arrived at this juncture, follow our journey as we try to shed some light on the issue.

The beginning – according to scientific research vegetation had evolved on Earth approximately 700 million years ago and fungi and bacteria approximately 1,300 million years prior, this evidence is based on the earliest fossils of those organisms. The general consensus is that organisms also called microbes are beneficial for example, they keep nature clean by helping break down dead plants and animals into organic matter.

However, in the dinosaur periods Triassic (251.902 to 201.3 million years), Jurassic (201.3 to 145 million years) and Cretaceous (145 to 66 million years ago) we know creatures that roamed the planet were predominantly herbivores; but not all. Carnivores also existed and confrontation between the two resulted in carnage on an immeasurable scale. All animal and vegetable life whilst decaying gives off a rank fetid odour attracting bacteria and pathogens to take hold and multiply and thus eventually spread and infect. Fortunately early hominins had yet to evolve hence were oblivious of the problems of that time.

Paleolithic Age

Mankind’s contribution – the Hunter-gatherer culture developed among the early hominins of Africa, with evidence of their activities dating as far back as 2 million years and according to Richard B. Lee & Richard Daly of the Cambridge Encyclopedia of Hunters and Gatherers “was humanity’s first and most successful adaptation, occupying at least 90 percent of human history“. In addition, it is understood that through archaeology, anthropology, genetics, linguistics and the advent of writing from primary and secondary sources this information is relatively common knowledge.

Colin Tudge in his book ‘Neanderthals, Bandits and Farmers: How Agriculture Really Began’. New Haven, CT: Yale University Press (1998) contends that.”The Neolithic saw the Agricultural Revolution begin between 10,000 and 5000 BC in the Near East Fertile Crescent” (Mesopotamia). During this period humans began the systematic husbandry of plants and animals and as agriculture advanced, many humans transitioned from nomadic to a settled lifestyle as farmers in permanent settlements. The relative security and increased productivity provided by farming allowed communities to expand into increasingly larger units, fostered by advances in transportation.

However, Alina Polianskaya of Inews.co.uk (March 15th 2018) points out that “Early humans may have been trading with each other much earlier than previously thought, scientists excavated ancient artefacts at Middle Stone Age sites dating back 300,000 years at the Olorgesailie Basin, in southern Kenya. They uncovered weapons made of materials that could not be found there, suggesting hominins at the time may have exchanged goods with others.”

In his paper ‘Evolution: What Makes a Modern Human’ Nature. 485 (7396) (2012) Chris Stringer tells us that “Modern humans spread rapidly from Africa into the frost-free zones of Europe and Asia around 60,000 years ago.” This notion is supported by Adam Hart-Davis in his work ‘History: The Definitive Visual Guide’. New York: DK Publishing “The rapid expansion of humankind to North America and Oceania took place at the climax of the most recent ice age. At the time, temperate regions of today were extremely inhospitable. Yet, by the end of the Ice Age, some 12,000 years ago, humans had colonised nearly all ice-free parts of the globe“.

The Silk Road – a network of trade routes connecting China and Far East with the Middle East and Europe, was established when the Han Dynasty in China officially opened trade with the West in 130 BC. Although these Silk Road routes were protected from exterior forces by the Han and other countries under signed treaties, ‘unseen enemies’ (pests and disease) also travelled with the traders causing infection, sickness and often death, because those who came into contact with these infectious bacteria had no immunity for example. In 541 to 549 AD the Justinian plague recorded by the Greek historian Procopius court historian to Justin 1st. (r. 527–565) was the first major outbreak of the first plague pandemic.

Emperor Justin 1st

The plague Yersinia pestis is a gram-negative rod-shaped, coccobacillus bacteria that is related to both Y. pseudotuberculosis and Y. enterocolitica. It is a facultative anaerobic organism that can infect humans via the oriental rat flea. Y. pestis was discovered in 1894 by Alexandre Yersin, a Swiss/French physician and bacteriologist from the Pasteur Institute. Strains of Y. pestis closely related to the ancestor of the Justinian plague strain have been found in the Tian Shan, a mountain range on the borders of Kyrgyzstan, Kazakhstan, and China, suggesting that the Justinian plague originated in or near that region. It is estimate in some quarters that the Justinian plague killed between 30 and 50 million people – about half the world’s population at that time and that was just the beginning of what was yet to come.

Alexandre Yersin

The Silk Road routes remained in use until 1453 AD, when the Ottoman Empire boycotted trade with China and closed them. It has been nearly 600 years since the Silk Road was used for international trade, but the routes have had a lasting impact on commerce, culture and history that resonates today and now they are being reopened. Today international trade is arguably the most important factor in the modern world as nations rely on others to supply the many types of commerce they need, hence agreements are signed to lessen the bureaucracy. Nonetheless, international trade does bring problems as we shall find out in this series.

Some countries enforce stringent rules on imports for example, Australia probably has the strictest regulations on what is imported, meat products, fruit and plant material including seeds from many countries including Asia and Middle East are prohibited, but some are permitted if the exporter is registered and has the required documentation. Unlike the rest of the world Australia (although having its own disease problems) is free of many other known diseases and has been since 1872, due to stringent pre and post-border measures; meanwhile the rest of the world continues to battle with disease containment.

Today much has changed we have advanced – science and technical horticultural knowledge has allowed us to become adept in food production; new plant species have been introduced, more variety and apparently more taste – but have we gone too far? -The reason why this question is asked is because for every action there is a reaction often resulting in irreversible consequences.

In part 2 of ‘unseen enemies’ we continue our journey giving more factual information on for example, how pests and disease endemic to a particular part of the world are now commonplace in many other regions; the result of man’s actions and the devastating outcome. Until next time, BW, Nik.

Article 61 – ‘A balanced composition’

Hi, welcome to Taiga Bonzai in this post we discuss the marriage of tree and container starting with the definition of the Japanese word ‘Bonsai’ (the umbrella term for this art) – ‘Bon’ is pot and ‘Sai’ is tree.

Introduction – as we have often stated, the old rules are today mere guidelines nonetheless, they contain logic, common sense and a learning curve for the multitude who practice the horticultural art of bonsai. Arguably one of the most important factors is the overall composition of how a plant in its container is perceived, our latest book Taiga Bonzai Simplifying the Art ‘Revised Edition’ (which can be found on google play books) goes into lengthy discussion on this topic. Because bonsai like other art forms, paintings, sculpture, music, fashion and culinary has its critics and pundits who review the work by said artists, which can often be unforgiving.

A balanced composition – it has been said by the bonsai masters that the four types of pots used in bonsai, which include rectangularround oval and deep square glazed or unglazed are designated for particular tree designs for example, conifers are normally associated with unglazed pots whereas deciduous varieties are suited to glazed containers. These pot types are classed as masculine, feminine and neutral, deep square pots are only for cascade Kengai and semi cascade Han-Kengai, of course pot designs have changed over the decades, colourful designs, fluted, eight corner bowls and moon bowls are now relatively common; the identification of pots is shown below.

1. Masculine 2. Feminine 3. Neutral 4. Cascade pot

Masculine pots are normally quite deep with robust corners, feminine pots can be round without sharp corners or lines and oval pots will have a gentle rim also without lines, deep square pots are wider at the top with tapering sides as shown. By looking at the image the masculine pot would be ideal for a robust pine formal upright Chokkan or informal upright Moyogi as the pot’s design and colour (unglazed) would enhance the rough texture of the bark and dark green foliage.

The feminine pot (glazed/unglazed) would suit a delicate Japanese Maple Acer palmatum, Juniperus sabina, or a flowering species, designs can include literati Bungin or slanting Shakan. The oval pot (glazed) could be used for most tree design to reflect the colour of the bark, leaf, fruit and flower for example, deciduous varieties including Beech, Fagus Weeping cherry Prunus and Rowan Sorbus aucuparia. As stated the rules are guidelines to assist us finding the correct pot for the plant in question because the tree is the painting and the pot is the frame and both must compliment each other, to explain further have a look at the image below.

Oopjen Coppit 1634 by Rembrandt

As the image shows the dress worn by the subject is black marginley distinguishing her from the dark background, it is the skin tone of her hands and face and the lace shawl that stand out making the painting what it is; quite remarkable yet subtle. But more importantly it is the overall composition of frame and picture that is the main factor. The gilded frame probably a heavy wooden moulded/carved one has a warm luster with various tones opposed to a brassy-gold finish and it can be argued that picture and frame compliment each other. But before we move on go back to the painting and in your mind substitute the gilded frame for one of polished aluminium – would the composition be correct? this same consensus applies to bonsai; pot and tree.

In article 57 ‘The wait is over’ we took some time to choose a pot for our large S. aucupariaOmono Dai‘ class (100 centimetres or 40 inches) the tree has light green foliage, smooth grey bark, white flowers and orange fruit and is considered to be neutral. Strong dark colours such as blue or green would be overpowering disrupting the overall composition of tree and pot as would an brown unglazed pot; hence the decision was to go for glazed neutral white, which would be in balance with the tree’s colourisation.

As to the pot shape round bowls and ovals were discussed, but extensive searching did not yield anything suitable. Another option was to have one made, but this was out of the question due to lengthy production time, overall cost and delivery; the last option was a rectangular pot. Pot depth was another important factor to consider, a large deep pot although ideal for ‘root-run’ would be overbearing, the decision was to opt for a shallow depth rectangular pot that would be in harmony with the tree creating a balanced composition.

If you have plants in training it matters not what containers you use; metal, wood, clay or plastic however, if the aim is to eventually use a ceramic pot especially for public display much thought and consideration is necessary in choosing the correct pot. It is not just the pot style and colour, other factors have to be taken into account for example, trunk height and thickness, canopy spread, tree style and attributes, Chinese Penjing (Penzai) or Japanese Zen Buddhist styles. Moreover, ceramics can be expensive especially if hand made make sure the decision you make is the correct one.

If you are familiar with article 56 ‘Bug apocalypse’ regarding the reduction of insect populations vital to our existence, we mentioned an upcoming 4 part series called ‘Unseen enemies’. In these articles we concentrate on the increasing problem of invading pests and disease devastating agriculture, horticulture, natural woodlands and forests across the globe. Until next time BW, Nik.

Article 60 – ‘Germination! – no guarantee’

Hi, welcome to Taiga Bonzai in this post albeit short, we discuss the subject of germination because there is no guarantee that it will occur due to various factors.

Introduction – germination is the process by which an organism grows from a seed, spore or similar structure. The seed of a plant a relatively small package (although there are exceptions) is produced in a strobilus, (cone) carpel (fruit) or legume (pod) after the union of male and female reproductive cells. However, it should be noted that not all unions are successful, hence the seed/s lack embryo/s and will never germinate. In addition, some plants produce varying numbers of seeds that lack embryos; these are also infertile. Fully developed mature seeds in most plant species carry food reserves wrapped in a seed coat that splits open when the embryo begins to germinate.

Seeds – from certain fruit and vegetables for example, pomegranate, citrus (lemon-mandarin) and chilli varieties obtained from the supermarket have the ability to germinate, but many others will not because they are immature, have no embryo and thus are sterile. Another factor concerning germination failure is because the fruit when picked was unripe, hence the seeds have not reached the maturity required for germination. With some apple varieties it is possible to grow a tree from seed, but it will be genetically different and usually inferior to the parent tree and any fruit produced will not be the same. Most apple trees are propagated by grafting allowing growers to produce trees that are genetically identical to one another.

In nature trees have particular ways of dispersing their seeds by the wind, by animals and birds that consume and dispense them through their digestive system. Such seeds released from the parent plant are in what is termed as a dormancy stage, and dormancy is a natural state of being in many plants, its function is to ensure that the seed will germinate at an appropriate time. However, seeds can remain in a dormant state and fail to germinate although conditions, temperature, water and light are in adequate supply.

Dormancy – why this phenomena occurs can be attributed to a seed’s morphological and physiological requirements, because seed dormancy is able to originate in different parts of the seed, for example, within the embryo or its coating – the shell or husk. Thus, dormancy can be deemed not as a constant, but as a variable because it is a common phenomenon encountered in a large variety of trees. To break dormancy and initiate germination, the process of stratification is needed and this method requires different techniques of which, there are various approaches depending on a particular species of seed.

Seeds having two dormancy combinations, a seed coat dormancy and an internal dormancy (embryo) require the seed coat or shell to be treated first either by soaking in water and/or scarification. The internal dormancy is then subjected to the following treatment. Cold to break bud dormancy then warm temperatures to initiate root growth and to encourage the shoot to sprout and complete the germination process. There are various methods of scarification and stratification, but the most common approaches are: Cold stratificationWarm stratification Warm and Cold stratification. The article on stratification and scarification can be found on this site ‘The stratification of seeds’ January 29th 2017

Some seeds including the pomegranate, Punica granatum the lemon and mandarin orange genus Citrus, a popular choice among bonsai enthusiasts can be stratified in a warm environment quite easily. Wash and dry the seeds to remove any fruit residue to prevent any attack from pathogens and fungal attack which, can cause the seed to rot. Then plant them in a propagator or sealed container with a moist soil medium and place in a warm environment temperature between 18-24°C. (65-75°F) You can use moist soft kitchen paper under and over the seeds as an alternative to to using soil.

Pomegranate 5 years from seed

Other common factors contributing to germination failure are: Old or unviable seeds – Unclean containers that may be contaminated with pathogens – wrong soil medium – wrong time of year – inadequate temperature – planted too deep – and insufficient water or over water. Why not have a go at growing plants from seed, it is a cheap and easy method in obtaining trees – an experimental learning curve; until next time BW, Nik.

Article 59 – ‘Fertilizer is not food’

Hi, welcome to Taiga Bonzai in this post we discuss the purpose of fertilizer, often misunderstood and misused.

Introduction – the ideology that fertilizer is a source of food is a misnomer, because plants produce their own food in the form of sugars via photosynthesis and moisture from the soil. The minerals in fertilizer provide the ingredients needed for photosynthesis and growth, when minerals are deficient or absent in the soil, fertilizer is added to maintain an adequate supply.

Plants – in their natural settings are able to survive quite well mainly due to their root systems, which have the ability to spread and travel great distances in search of moisture and nutrients. But bonsai are confined to relatively small containers and thus are restricted from this practice therefore, they have to be fertilized. The questions of which fertilizer to use, solid or liquid, what is the dosage rate and how often to use it, one might assume it would be relatively straightforward and this is where mistakes are made, which in many cases cannot be undone; hence a little more thought on the subject is required.

The pH factor – the first step is understanding from where the plant originates and the soil type in which it is grown be it ericaceous (coniferous) or organic (deciduous) and the relevant pH factor. Detailed descriptive articles on these topics can be found on this site, ‘Bonsai Soils’ March 27th 2016, ‘The pH factor (part I)’ April 22nd 2017 and the ‘The pH factor (part II)’ May 6th 2017, these are important steps in the learning curve of knowing, which directive to adopt; especially for those new to bonsai horticulture.

Soils – of course many horticulturists make there own soil compositions depending on the species and their specific needs, some use Akadama (akadamatsuchi, red ball earth) a naturally occurring, granular clay mineral used as soil for both deciduous and coniferous species, Seramis, Turface and Oil-Dri that are fired clays whilst others will use soil from the same location of where the plant originated; if at all possible.

However, there are other factors to consider because soil contains a multitude of living organisms that consume, digest, and cycle nutrients. These include archaea, bacteria, actinomycetes, fungi, (mycorrhiza) algae, protozoa, and a wide range of insects; mites, nematodes, earthworms and ants all of which are important to the vitality of a soil composition. Such organisms are classed as either acidophiles, (that thrive under acidic conditions) Neutrophiles (that exist in a neutral pH environment) and Alkaliphiles (a class of extremophilic microbes capable of survival in alkaline environments).

Another factor is the balance or imbalance of a soil’s chemical structure and the three primary nutrients are nitrogen (N), phosphorus (P) and potassium (K). Secondary nutrients include sulphur, calcium and magnesium, minor nutrients consist of iron, manganese, copper, zinc, boron, molybdenum and chlorine. Soils with high acidity may have toxic amounts of aluminium and manganese.

Nitrogen (N) is essential for growth and a necessary part of chlorophyll helping plants photosynthesise, phosphorus (P) is needed for the development of flowers, fruits, and root systems. Potassium (K) keeps roots healthy, aids in the flowering/fruiting process and assists in aiding plants tolerate stress to some degree through periods of drought therefore, a soil test kit is advisable to check the balance between them. (See article the ‘The pH factor (part II)’ section Soil testing applications).

Having conducted a soil test and determined the balance or imbalance one can select a fertilizer that will give you the correct amount of nutrients required. On any package of fertilizer be it powder, granulated or liquid there are three numbers that correspond to the amounts of nutrients in the product for example. 5-5-5 is referred to as a balanced fertilizer due to (N) (P) and (K) having equal quantities. Other fertilizers may show a different numbering for example, 4-10-6 which indicates that (N) is low (P) is high and (K) is medium. This numbering system is the same for all manufactured fertilizer products regardless of their form.

However, different species require fertilizers suitable to their needs for example, conifers are not considered to be heavy feeders hence one annual application of a complete garden fertilizer such as 10-10-10 or 16-8-8 will suffice, which can be applied in early spring before the plants break dormancy, or in late autumn. Deciduous trees and shrubs require a more well-balanced fertilizer, in which the three main nutrients are closer in proportion, such as 10-10-10, that provides nitrogen for green healthy foliage, phosphorus and potassium for flowering, fruiting and root development.

Applying fertilizer – how often are bonsai trees fertilized due to their confinement? There are a lot of arguments on this topic because all species are individuals each having their own requirements. Some advocate a weekly basis whilst others state fortnightly or monthly is adequate in addition, fertilizer should be given sparingly after watering has taken place. The general consensus that bonsai can or should be fertilized during the entire growing season from early spring to mid-autumn has logic however, older mature trees are often fertilized less frequently. Much depends on the species, time of year, stage of development and health; indoor trees can be fertilized all year round. The problem with over fertilization boosting the (N)-(P)-(K) levels can weaken and stress out a plant often causing its demise.

Left = liquid – right = granulated

Which form of fertilizer to use, powdered, granulated or liquid? – There are many different opinions from all quarters on this subject, some argue that liquid is better because it is instantaneous, but it usually drains out of the bottom of the container although much depends on the quantity given. Some maintain that a top dressing of powdered fertilizer is better as it penetrates into the soil after watering, although the majority of the particles will remain in the pot there will be a loss due to drainage. Others plumb for granules tiny pellets that are mixed in the soil when the container is being prepared, these are slow release and are preferred by many.

Another factor to consider is the cost of fertilizer, many fertilizers if in liquid form normally come in small bottles and if purchasing online the cost of shipment is added increasing the overall price. A 250ml bottle diluted 4 times (1.5 litres) will not last long during a season although much depends how many trees are in the collection and how often they are fertilized. Whereas half a teaspoon of granulated (slow release) added to the soil medium at repotting time will last at least two seasons. If one is unsure of what fertiliser to use the well known horticulturist and TV presenter Alan Titchmarsh gives a good presentation on this subject. (link to his presentation is given below)

As stated fertilizer is ‘not food’ nor is it a ‘one-size-fits-all’ it is a way of replenishing the nutrients within the soil medium which the plant needs for healthy growth and each species will require a specific level of nitrogen (N), phosphorus (P) and potassium (K) to sustain this. Hence it is advisable to do a soil test before purchasing fertilizer, because there has to be an accepted balance between (N), (P) and (K) for each species, this does not mean to say that you need an assortment of fertilizers far from it; one for conifers and one for deciduous will suffice. Until next time, BW, Nik.

Article 58 – ‘Wiring a Ficus’

Hi, welcome to Taiga Bonzai, in this post we look at an alternative way to wiring a Ficus retusa.

Introduction – This small Ficus ginseng (Ficus retusa) in the Komono class (15cm to 26cm) native to Asia has been pruned many times over the years and the cuttings were preserved by placing them in a glass jar filled with tap water. After a few weeks, the cuttings developed root systems and were planted out in plastic pots and when stable (good evidence of growth) were given to students to practise their bonsai styling skills.

Ficus ginseng

Question – We get questions on styling to which we respond, but we are of a conviction that ‘one learns by doing’ nevertheless, here is a question we received from one of our followers on this very subject. “I wired my Ficus into its intended shape, but when I went to check it weeks later the wires had caused deep grooves in the bark, my question is will these grooves pop back out?

Answer – In short the answer is no, because attention to wiring detail has not been paid, hence the plant is disfigured with bark damage and disruption to the phloem and cambium rendering the plant useless as a potential bonsai; Ficus like many other species of the genus have soft bark and phloem and cambium are easily damaged.

Course of action – Much depends on where these indentations are located be they on the trunk or branch and how long they extend, the unaffected areas can be used for new cuttings, hence your Ficus becomes a donor plant. We realise that this is a set back and not what you want to hear, but in reality there is no option you cannot undo the damage that has been done. However, do not discard the rest of the tree, remove the damaged section/s and let the plant recover; there is a possibility that it may produce new shoots as this species is quite resilient.

A different approach to wiring a ficus – Although native to Asia the genus Ficus is found all over the globe usually as house plants or decorative attractions in shopping malls for example Ficus benjamina and many are used in bonsai. However, they do not take kindly to wiring, because (a) of the soft bark easily damaged (b) they have no dormancy period unlike deciduous species from Europe and North America and (c) they are not hardy. Therefore, one needs to adopt a different approach and that is by using guy wires apposed to actually attaching the wire to the tree. The image below depicts a Pine Pinus sylvestris that has been wired using the guy wire method.

By looking at the image you can see that wire 1. is the anchor holding the tree in it’s container it also counter balances the force as wire 2. is pulling the upper mid section of the trunk down, the same process is repeated for wires 3. and 4. This balance of action and reaction stabilises the tree when a branch or trunk is severely bent, because the inside of the bend is now in compression and the outer radius is now in tension; because for every action there is a reaction. You will also notice there are black rings where wires 1. 2. 3. and 4 are attached, this material is thick felt which, prevents the wires from damaging the bark, phloem and cambium.

Of course this operation was conducted on a sturdy pine that can take this kind of treatment, whereas a ficus cannot nonetheless, it can be done although the amount of tension has to be less severe and the shaping or bending process has to be done gradually. One can shape a ficus quite easily using the guy wire method as it will conform to its given shape in a short space of time depending on the thickness of the trunk or branch; unlike a conifer which takes years.

After a short time period (2 to 3 weeks) loosen the wire to ascertain if the branch is holding it’s new shape, if the operation is a success you can proceed with your next plan of action, if not re-attach the wire and wait a little longer. In addition, ensure you use felt, leather, rubber or some other cushioning material to prevent the wire from damaging the plant. However, if you wish to wire the trunk or branch in the conventional way you can, but use a thicker wire and loosely wire the proposed section into shape, but check it on a weekly basis otherwise you will recreate the same problem.

Another point to consider is the type of style one is aiming for, the following are classic styles: Formal upright (Chokkan), Informal upright (Moyogi), Twin trunk (Sokan) and Slanted (Shakan) are possibilities for this species, but Literati (Bunjin-gi), Semi cascade (Han-kengai), Cascade (Kengai) and Broom (Hokidachi) should be avoided as ficus is not in reality adaptable to these styles; alternatively you can make your own design there is nothing in the rule book which states you cannot as we have done with our specimen depicted above. Until next time, BW, Nik.

Article 57 – ‘The wait is over’

This article is an update on a twin trunk Sorbus aucuparia rescued from an area of wasteland being prepared for development in early spring of 2015. The folklore and scientific information on the species can be found on this site Sorbus aucuparia (Rowan or Mountain ash) October 11, 2017′ but for those whom require a brief update please continue reading.

When the plant was collected its height was in excess of 2 metres and thus had to be reduced, as the fronded-like leaves are quite large it was decided that, the plant would be suitable for the ‘Omono Dai‘ class (the first category for large bonsai trees 100 centimetres or 40 inches. 70% of the root ball was removed and the foliage was reduced to maintain a balance between the nutrients to the leaves and roots respectively. The plant was placed in a wooden box in a standard soil mix with slow release fertiliser pellets and moved a semi shade area to recover.

In the spring of 2016 it was needed to reduce both trunk’s height due to the large amount of buds that had formed, (red broken circles) hence the cuts were made from the back of the tree at an angle to hide them, these were covered with petroleum jelly (vaseline) a) to allow for moisture run off and b) to prevent possible infection from pathogens. (The visible rubber coated block of wood was placed there to keep both trunks separated, this was later replaced with a specially designed expansion clamp the article for this subject is also found here; Expansion clamp design and construction – May 15, 2019)

S. aucuparia mid summer 2016

In spring 2017 the tree was replanted in a large modified plastic container and pruned to encourage foliage growth with the hope that leaf size reduction would occur as shown below.

S. aucuparia mid summer 2017

As the yellow arrows show there has been a slight reduction in leaf size however, the plant did not produce any flowers nor did it in 2018, 2019 and 2020, probably due to the constant hard pruning it has received, which has set it back somewhat.

S. aucuparia mid summer 2021

In May of this year there were cold spells with bouts of snow, hence growth has been retarded, this is the same plant in June of 2021 – leaf size has been significantly reduced and it has finally flowered top left.

S. aucuparia in bloom June 2021

As stated the growth rate has been retarded nevertheless, it is possible that flowers on this plant will be produced on the right of the two trunks, but we will have to wait until 2022 as it is too late for this season. It is now 2nd week of August and the fruit have turned orange, but we still have to be patient because they may turn red which is a useful factor in deciding on what colour of ceramic pot will do the tree justice.

S. aucuparia August 2021

Choosing the pot – In studying this twin trunk (Sokan) we see that the design is arguably reminiscent of a dancing couple (male on the left – female on the right) in graceful movement. The bark is grey, foliage is light green flowers are white and berries at this juncture are orange, this suggests that the whole combination has a light tone to the overall composition; therefore, in keeping with this theme the intended pot should reflect these factors.

According to the bonsai guide lines the tree is the picture and the pot is the frame, strong dark colours would be overpowering disrupting the overall composition of tree and pot as would an unglazed pot. Hence the decision was to go for glazed neutral white. As to the pot shape we looked at round bowls and ovals but, these taking into consideration the height of the tree would not look correct therefore, the last option was a rectangular pot.

In addition, pot depth was/is another important factor to consider, bonsai pots are classed as masculine, feminine and neutral; this twin trunk is considered to be neutral. A large deep pot although ideal for ‘root-run’ would be overbearing for this S. aucuparia, the decision was/is to opt for a shallow depth rectangular pot that would be in harmony with the tree creating a balanced composition.

Dimensions 40x28x7,5 cm

Obviously the tree has to undergo more training, pruning and wiring which, takes time. A living organism such as this plant has many changes in its yearly cycle of growth, changes that cannot be disrupted we can only go with the flow as said before patience is a virtue. Nonetheless, we believe it has bonsai potential, but time will tell. Until next time BW, Nik.

Article 56 – ‘Bug apocalypse!’

Introduction – ‘Bug apocalypse’ is a prelude to a 4 part series ‘Unseen enemies’, which looks at the increasing problem of invading pests and disease devastating agriculture, horticulture, natural woodlands and forests across the globe. These will be posted at a later date because, this article concerning the decline of our insect population looks at a problem that is now making headlines around the world.

The decline – Over the last few decades there has been an increasing decline in the insect population. Disappearing are many helpful predators including, Ladybugs Coccinellidae, Green Lacewings Chrysopidae, Honey Bees genus Apis, Praying Mantis family Mantidae, Spiders family Arachnida, Ground Beetles family Carabidae, Soldier Beetles family Cantharidae, Assassin Bugs family Reduviidae and Robber Flies. Asilidae

These insects are part of the food chain they eradicate unwanted pests including aphids, scale, mealy bugs and saw fly and in turn are the main resources for many birds, small mammals, fish, reptiles and other creatures. Moreover, they are an important key for human food production because, many crops depend on insects for pollination leading to fruit and seed production. Insects play a very important role in decomposing organic matter allowing nutrients to return to the soil and support the on coming crop season. Therefore, in terms of insect ecological importance, a sharp decline in their abundance is of great concern.

The arguments – Here are the points view from others whom are mindful of this issue. Will de Freitas asks if we are facing insect Armageddon he states that, “A recent study found that German nature reserves have seen a 75% reduction in flying insects over the last 27 years. The researchers involved made stark warnings that this indicated a wider collapse of the general insect population that would bring about an ecological catastrophe if left unchecked.”(article – October 25, 2017 – The Conversation)

Damian Carrington Environment editor for The Guardian in his article (10th February 2019) argues that “The world’s insects are hurtling down the path to extinction, threatening a catastrophic collapse of nature’s ecosystems.” “More than 40% of insect species are declining and a third are endangered, the analysis found. The rate of extinction is eight times faster than that of mammals, birds and reptiles; the total mass of insects is falling by a precipitous 2.5% a year, according to the best data available.”

In the February 2020 journal Biological Conservation no, 242 (a leading international body of scientists in the discipline of conservation science) Editor in chief Vincent Devictor of the Institut des Sciences de L’Evolution de Montpellier, France stated that. “We are causing insect extinctions by driving habitat loss, degradation, and fragmentation, use of polluting and harmful substances, the spread of invasive species, global climate change, direct over exploitation and co-extinction of species dependent on other species.”

Devictor goes on to say that “With insect extinctions, we lose much more than species. We lose abundance and biomass of insects, diversity across space and time with consequent homogenization, large parts of the tree of life, unique ecological functions and traits and fundamental parts of extensive networks of biotic interactions. Such losses lead to the decline of key ecosystem services on which humanity depends.”

According to http://www.magnificentmeadows.org.uk “The UK’s remaining rich grasslands now cover a minute fraction of the area they once covered, even relatively recently in the early 20th Century. There were once natural wildflower meadows in every parish – today only 2% of the meadows that existed in the 1930’s remain. Nearly 7.5 million acres of wildflower meadow have been lost so far and they are still being destroyed.”

The blame game – These are but a few of the arguments from scientists and conservationists from the many we have researched and from these points of view it appears we have a major situation on our hands. There are many theories as to the decline in insect populations they include, habitat destruction by intensive farming and urbanisation, pesticide use, introduced species, climate change, eutrophication from fertilisers, pollution and artificial lighting; the latter used in huge polyethylene tunnels for intensive crop production.

Yet, despite the scientific evidence provided, globally our performance in instigating effective insect conservation is below par, we need to realise this fact and act accordingly. This would involve more inclusive education, better decisions with land managers and government officials in maintaining unique habitats, across the globe. To have more expansive sustainable agriculture and forestry, improved regulation and prevention of environmental risks and greater recognition of protected landscapes.

But the frailty and idiosyncrasy of human nature is what it is, the world’s heads of state congregate at summits and conferences to find ways to solve problems, each pointing the finger blaming the other for their misgivings when they themselves are equally responsible for the same actions. It is fickleness, bureaucratic hypocrisy by the asinine in an attempt to maintain ‘stability’, (economic, environmental and social or profits, planet, and people) a mind set proposed for the wealthy not the masses.

As the world’s population increases more land for housing, food production, highway construction and industrial complexes are required to support the increasing demand resulting in irreversible changes to the environment. Insects are a major component of the tapestry of life and failure to protect them will have dire consequences. It is now time for heads of state and their minions to refrain from ‘putting their heads in the sand’ and listen to the scientists to prevent a ‘Bug apocalypse.’ Until next time, BW, Nik.

Article 55 – ‘The new book’

This is not a publicity or marketing ploy to promote our ‘new book’ (Taiga Bonzai Simplifying The Art – Revised Edition) it is to inform the many whom have asked where is the book and on what platform is it available? Our sincere apologies for the time taken to respond, but publication was delayed due to complications we had to address due to the following.

The original book (Taiga Bonzai Simplifying The Art) was sent for publication in 2018, but it’s progress to date remains unclear although we have tried on numerous occasions to contact the publishers without success. In addition, a contract between the publishers and ourselves was entered into which is legal and binding, hence we were prohibited from publishing elsewhere.

To solve the problem the book was re-written during 2020 with more chapters, content and images being added, making it into a ‘Revised Edition’ which is different from the original work. In addition, the original art work for the book’s front and back cover could not be used as this would breach the terms of the contract, it had to re-done which took time to complete.

As this new book will be published as an ‘E-Book’ choosing the right platform was not an easy task as there are many available with all having rules and regulations of one kind or another, hence a lot of research was needed. We decided to go with Google Play and the new book will be available beginning of this month ‘August 2021′. We do not envisage any technical problems, but if there are – our contact details can be found in the ‘About’ section at the top of the article.

According to Google indexing a book usually occurs within 48 hours on Google Play and for Google Books it can take up to 2 weeks. After indexing is complete, people are able to search for the book by either it’s title, author or the book’s ISBN or simply search for the book on Google Play Books. Alternatively, here is the ‘Google Play Books’ link for the book: https://play.google.com/store/books/details?id=GGKEY:FEGZU8E1P6Q

The original book took 4 years to research and write with an additional 18 months for the re-write, art work and platform research, taking into consideration these factors we believe that (€15,00) is a fair price for a comprehensive 200 page book on bonsai horticulture. Moreover, as we are ‘non-profit making‘ all proceeds go to education and research.

The next post article 56‘Bug apocalypse’ will be available August 8th, because at this juncture it is a ‘hot topic’ among the scientific fraternity – until next time, BW, Nik.

(New book front and back covers below)

Article 54 – ‘Summer pruning’

Introduction – The pruning of a bonsai tree is probably the most important single factor in the forming of its shape, perhaps more so with deciduous than with conifers due to their rather intensive growth. Pruning as such can be divided into four main headings, Root, Heavy branch, General and Leaf. When pruning roots and foliage it is often stipulated that what percentage removed from the roots should be reflected in the foliage and visa versa, because this reduces stress maintaining a balance between the tree’s two sections.

Nonetheless, there are those who disagree they contend that some deciduous species can have their foliage completely removed in the growing season to encourage new growth. This Ginkgo biloba spends the colder months (October to May) inside under LED grow lights with a constant temperature of 24 degrees C. Complete leaf drop occurs when it goes from inside to outside (late May) but, within 4-5 weeks it is back in leaf. This situation repeats itself when it is returned indoors, (mid September) thus the tree loses its foliage twice in a relatively short space of time; an 8 to 10 week period of no foliage, which does not effect the tree’s health. The reason why leaf drop occurs twice is due to environmental change – not the plant entering dormancy.

Ginkgo biloba

To further this discussion a Himalayan juniper Juniperus squamata was obtained in early spring 2021, according to the fact sheet this plant should be located where it receives full sun; a minimum of 5 to 6 hours per day. We decided to experiment by adopting a different approach, a round Japanese bonsai pot was selected, but as the tree had a large root ball, 60% of it was cut away in order for it to fit the pot – none of the foliage was pruned resulting in an imbalance between root and foliage. The plant was then placed in a location that has full shade and as the image shows, the plant is thriving with no ill effects; this juniper will be left for a few years before styling begins.

Himalayan juniper J. squamata

The argument of maintaining an equal balance between root and foliage has theoretical logic and in many cases may prove to be correct with certain species of plant but, as we have demonstrated here there are instances where such logic does not apply nevertheless, debates on this subject will no doubt continue.

Root pruning – is carried out periodically because bonsai grow in small containers. Such confinement forces the root system to encircle the entire pot area saturating it in a dense mass, the result is the plant becomes ‘pot bound’. In this situation it begins to suffer because the much needed nutrients have been exhausted, circulation of air in the root mass is restricted and watering retention is increased. Deciduous species can be rigorous in their growth, hence it is prudent every 2 to 3 years to lift the plant out of the pot to check the roots ball’s condition whereas, coniferous species can be checked every 5 to 6 years, but much depends on the species and variety.

Foliage pruning – In 2017 we acquired a common juniper Juniperus communis which was trained as a cascade, (Kengai) it was left to grow and conform to its new design until July 2021 when pruning was much needed as the cascade appearance was masked by excessive growth. Branches had intertwined and were invisible, foliage was dense creating a hiding place for unwanted minibeasts moreover, it restricted air flow. Below are two images of this plant – before and after.

Juniperus commnunis cascade (Kengai)

As one can note there is a marked difference in this tree’s appearance and arguably there is improvement, but there is a lot more work to be done pruning wise. In addition, those with a keen eye will notice that this tree lacks a ‘top knot’ or crown, the original 3 branches at the top succumbed to the 2017 winter period and were later given a Jin or shari look. However, there is a small shoot protruding out from underneath the upper most bend that hopefully will replace those that were lost.

The next plant to be given hard pruning is this Sea Buckthorn Hippophae rhamnoides being trained in a Literati or Bunjin style. In the left image the foliage is masking the branches of which there are 3 as shown in the right image with the top one the main branch. This branch when dormancy arrives will be wired into shape and allowed to extend further down towards the container, the other two branches will probably be reduced and wired into new positions; and the ‘top knot’ will be allowed to develop. This Sea Buckthorn is only a young tree, (6 years old) but has the potential to become a Bunjin.

Sea Buckthorn Hippophae rhamnoides

Pruning in generalHeavy Branch Pruning – with trees obtained from nursery sources or from the wild, pruning can be carried out immediately however, with established trees waiting till the autumn to prune is more convenient as the form or shape of the tree, especially with deciduous varieties, can be visualized more easily.

The rules for initial heavy branch pruning are not written in stone, they are more of a guideline. Having decided what the material or plant’s potential may be, one can start work. But before brandishing the shears, a good tip that some bonsai enthusiasts undertake, is to either (a) take a photograph, which can be downloaded to a computer where the style can be enhanced via a suitable program, or (b) draw a sketch of the plant; doing this allows you to finalise the design.

The ‘hand drawn’ image below shows a plant selected to be grown as an informal upright. (Moyogi) Working from the bottom of the tree, a low branch protruding at the front has been removed, as has the opposing branch above it. Further up, the tree has developed a cartwheel effect meaning that more than two branches appear at the same height on the tree; in this case two branches were removed. At the top, the branch on the right had possibly been damaged at some time and rather continuing to grow to the right, had grown across the front of the tree and this was removed. The illustration shows the effect of this initial pruning.

Heavy branch pruning

Different styles of bonsai require different forms of heavy pruning, as a general rule dead, damaged, or diseased branches are removed. But with conifers such branches are formed into Jins or Shari, which gives the tree a more aged-look. Jins and Shari are branches that have been stripped of their bark and cambium layer then coated in lime sulphur, which bleaches the branch. With heavy pruning, there will be wounds and these are susceptible to disease, some bonsai enthusiasts advocate the use of expensive cut pastes to seal the wounds, some use petroleum jelly (Vaseline) a fraction of the cost; whilst others do nothing allowing the tree’s natural defences to heal itself.

General Pruning – is carried out throughout the growing season and with most varieties it begins almost immediately they begin putting on the new season’s growth. New growth of all trees can be pinched or removed with the fingers, but if a tree is left until this growth has begun to lignify or harden off, then sharp shears will be required. Pruning is done to maintain and improve the shape and symmetry of the tree and ramification, it is also necessary for the tree’s health.

Leaf pruning

Leaf pruning – is a method of increasing leaf coverage and fine twig-lets it also assists in reducing leaf size, but it should only be carried out on trees that are healthy and are growing strongly; in some cases more mature trees are less vigorous in their growth for this treatment. June (Depending on the climate zone) is the time when all the leaves except for the petiole (leaf stalk) are removed and after a period of time, approximately 2 to 3 weeks, new leaves and branches will form. However, it should be noted that leaf removal is restricted to deciduous trees, never with conifers, flowering or trees bearing fruit. The above illustration shows how leaf pruning is carried out on pines, junipers, maples and zelkova. (N.B. if you wish to contact us email information is in the ‘about’ section.) Until next time, BW, Nik.