We were supposed to have aBonsai Society meeting today, which would have been the first one in a long time. Last night at 9pm, a change in alert levels was announced which means that where we live, social distancing is in place and as the venue is quite small, not the best for safety in the current Covid climate. That was called off.
I had this tree that I wanted to work on at the meeting. Basically just a clean up job and then lots of wiring to set the foliage pads. It is a Pine tree and in the twin-trunk style. Here is the before photo.
And here is the tree after the pads were set.
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I had to hide the introvert in my today when a small truck went past us and on the back there was a medium sized bush / tree clearly on its way to be dumped. The driver stopped and went into a shop while we waited outside. When the owner came out, I asked him if the tree is going to be dumped and when he confirmed that, I pulled out my Bonsaiplace business card and told him that I can create a Bonsai tree from the tree and he promptly agreed that I could have the tree.
Just a week ago we had a couple came to our private shop who had the idea that Bonsai are a specific type of tree and that you can grow them from Bonsai seed. I love these situations as it allows the educator in me to come out. This man (owner of the tree on the truck) said that it cannot become a Bonsai as it is not a Bonsai tree. Guess what? Out came the educator again.
Anyway, off we went with the tree in the back of the Bonsai mobile, speculating what type of tree it is. On arrival at home, I used a plant identifying app with no succes. In the process of cutting the branches off, I found a discoloured flower which looked very much like a withered Gardenia flower. I guess it is now wait and see and do more research to find its name. During this time it will have to be kept alive.
It does have some feeder roots and after I cut the branches, left it in a bucket of water to just chill a bit and hopefully get some sap flowing. As I do not like waste, I very cheekily took some of the roots with feeder roots intact and planted that up as well. These I will treat the same way as what I do with Maple root cuttings with which we have had great success.
All is now potted up, watered and in a sheltered position. Tonight I will start with the weekly tonic of seaweed extract to help stimulate more root growth.
Below are three Maple root cuttings in development.
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In Robert Steven’s book, Mission of Transformation (2009), he mentions in the Foreword that Critique has become a favorite tool of his as an effective way of teaching and learning. It is my experience that most clubs or Bonsai gatherings will include some or other Critique session, especially at large scale exhibitions or shows. It is customary for the head Judge or a visiting Demonstrator to undertake this task.
I have been witness to many of these and have also done my fair share of these Critique sessions. One of the most important aspects of these sessions is exactly what Robert points out in his book and that it should be an opportunity to learn. It is therefore very important that it is done in a constructive way to enable not only the owner of the tree, but all the spectators to walk away with more than just the negative aspects of the tree under discussion.
I like to start these sessions by asking the owner to tell the story of the tree. This gives you a good understanding of the history of the tree and by asking questions, dive into the aspects that really matter. Once this part is done, I like to first point out all the positives. Find something, even if there is very little to go with. There will always be a positive. As the focus is for this to be a teaching and a learning experience, lead the discussion by questioning. Use open-ended questions and allow as many people in the group as possible to answer and become part of the conversation. It becomes very boring if it is only the Commentator delivering the commentary. There is a danger here in that you at times have a very vocal participant who gets so excited that they tend to dominate the conversation. As you are leading the Critique, be aware of this possibility and gently bring the conversation back to focus on the tree and the whole group.
A good place to start is the overall picture or story that the tree on display tells. Look at the whole scene. After that, I prefer to start at the bottom and work my way up. Lead a discussion on the pot, then the surface soil and covering. After this it is the turn of the Nebari and then the trunk. From here, discuss the style and the appropriateness of that for the specific tree. The next part will be the branches and the foliage before the critique almost reaches its end with the apex. Once all aspects have been discussed, it is really important to summarise and come full circle to the positives and then end off with one or two actions for future development of the tree.
It is a time consuming exercise and in the case of a display with many trees, I prefer to only go with the three top trees and then also one or two Shohin displays. This way each discussion is more in depth and the value add is much more than just a walk through the exhibition and barely spending a minute or two with each tree. What I would like to see is that when it comes to multi-day shows, that the Critique is extended and broken up over more sessions across all days. This can be thematic i.e. each session focusses on only one style of tree (design) or split the trees in Evergreens and Deciduous trees or as mentioned above, do the Shohin separately. The main things is that there must be something new to learn for every participant and the owner needs to walk away with a feeling of accomplishment and also a few pointers on next steps for the tree.
This Redwood came to me just over a year ago and ended up on the bottom shelf as it was not a high priority to work on and a little bit ugly. Today was the day for this one to get attention and even if I have to say so myself, the ugly duckling is now well on its way to become a beautiful swan.
It has a very straight trunk and was chopped before it came to me. The taper is minimal, but can be enhanced with a bit of carving at the top. More interest can also be had by creating an interesting Jin out of the dead branch at the bottom. Most of the growth is at the top which normally lends itself to a Literati style tree, but in this case the trunk is nowhere near what one would like to see in a Literati style tree.
Decision time and it is to slant the trunk and then for the branches to droop downwards at an angle following the trunk line. Normally with this style the branches on the open side, in this case to the right, are longer than those on the closed side, or left side in this case.
The growth is still relatively young with no real solid branches at the top, but it is important to spread the branches / leaves radially out to enable all green parts to receive maximum light.
This Redwood will now rest until Spring, be fed profusely in a sheltered spot.
This Juniper came to me as a very neglected tree about a year ago. After a solid nutrition program and tender loving care it is now ready to get some work done on it. The major job will come in Spring (seven months away) when the first big repot with fresh soil will take place. For now, let’s get the pads placed in a better position and also do some thinning of the vigorous growth.
One of the fastest way to get a Bonsai collection going is to find material at your local nursery to develop over time into a stunning Bonsai. Yes, it takes time, but still beats starting from seeds or cuttings. Although My private collection mainly consist of mature trees, I regularly still work on anything from cuttings to nursery material. The main reason for this is to generate stock for my wife’s fledgling Bonsai shop.
Yesterday I bought this Juniper from our local Bunnings (hardware store for those outside of Australia and New Zealand). As luck would have it, I just recently saw a mature Juniper on Instagram with a slanting main branch and a smaller branch following the contour of the main branch. Another coincidence is that I recently went on a Dolphin watching trip on Guardian, the boat used by Dolphin Seafaris in Tauranga, New Zealand. Where does this fit, you may ask. Well, there were a lot of baby Dolphins with their mothers, swimming in close proximity of the mother and mimicking what they do. It might also have to do with the fact that they suckle on mommy dolphin twenty times per hour! Need to be close for that.
The first task is to clean the tree up as selecting the front was a given with the shape I wanted it to have. The clean up consists of removing unnecessary branches, just one in this case, and then all the growth pointing to the bottom and on top of the branches. It also includes cleaning the crotches between the main branches and the lateral ones. It just makes it a lot easier to apply wire.
Then the wiring starts. The same gauge wire was used on both branches as the smaller one also needed to be twisted and bend around to follow the main branch line. You cannot just bend it over as the leaves will have their undersides on top then. It needs a twist as well.
The final product. The main slanting branch represents the mother Dolphin and the smaller one the baby Dolphin. There is my memory of the Dolphin watching trip now captured in a starter Bonsai. Now for it to rest, watered, fertilized and kept out of harsh climate conditions.
Watch this space to see the updates, further development and potting) and also follow us on Bonsaiplace on Facebook as well as Instagram.
Although we worked on hundreds of trees, my clearest memory of a tree that my father and I worked on, was a very old Coral tree, Erythrina lysistemon. It resembled the tree below, but larger and more upright.
I have no idea what happened to this tree and I can just hope that is in someone’s collection and that it is as magnificent as the last time I saw it. This is now about forty years later which will make that tree roughly sixty to seventy years old.
A few years ago I was gifted a rooted cutting of a Coral tree by a friend, Willie van Winkel, in New Zealand. This was about six years ago and the cutting moved with us from Dannevirke to Tauranga. It was planted in a green plastic plant pot and did not like the colder climate in Dannevirke. When we moved to Tauranga it clearly enjoyed the warmer and more humid climate more, unlike some of my Maples and even a few Pines. It flourished and I allowed it to root through the bottom of the pot into the soil below.
The leaves are huge and there are way to many leaves. The main root growing into the soil is now cut and this will cause a problem as the large number and large size of the leaves will cause a lot of water loss through transpiration.
To solve the problem a major branch is removed and some of the larger leaves are also removed. All of the finer roots that grew in the pot are still intact and this will hopefully be enough to feed what is left above ground. The tree is now in a pot and what was removed has been treated with rooting hormone powder and will hopefully grow roots. There is an abundance of roots, the balance between roots and growth above the soil is hopefully good and now it will be treated like royalty and serve as a reminder of me and my dad working with Bonsai. A great memory and tribute to what I have learnt from him about Bonsai, his beloved Orchids and plants in general.
This Literati style Juniper came into my collection as a very neglected, half of the branches dead and under nourished tree.
Today it was time to get some wiring done through to the growth points. The previous and first wiring from me was just on the main branches to set them. As can be seen, the branches that were dead or with no hope of recovery were all jinned and these branches will be refined with sanding paper and lime sulphur later on.
The living branches, only three of them have responded nicely with new growth and these are kept in tact at this stage to get as much energy as possible to the green and new growth. This tree only received liquid fertiliser in the form of a marine plant / kelp conditioner with one dose of a granular feed, balanced NPK.
Here are some of the before photos
This type of work is quite light and I only used two thicknesses of aluminium wire and a wire cutter for this job. The coffee is not really optional, but I did have the mandatory glass of wine just before this job with a meal.
These are the after photos:
This tree will now rest and carry on with its fortnightly application of liquid food. This is applied over the leaves as well as the soil.
For us in the Southern hemisphere it is that time of year when Bonsai enthusiasts pack their bags, collect their tools and load up on enough supplies to go Yamadori hunting. Yes, we go crazy to get our hands on raw material that we can grow on to become aesthetically pleasing Bonsai.
The big questions related to this activity is based on safety and ethics. How do I do it safely and how do I do it ethically?
Safety always comes first. It starts with weather conditions, through to the equipment needed to keep you safe and also having a plan. If you go on your own, make sure you tell people what your plans are, where you will be and what time you will be back. If you are visiting a remote area and there is no cell coverage, then you will need a personal locator beacon.
Always make sure that you have enough food, shelter and clothing to last for three times longer than what you expect to be out. A safe way to do this is to write a list of what you will need and then use it to pack your stuff. On your return, revisit the list and update it for next time.
I see many people on a Bonsai hunt with very little eye, hand or feet protection when things like spades, saws and power tools like chainsaws are pulled out. Do not forget your ears when the latter starts up.
A big issue that we need to have a lot more conversations about is the ethical removal of trees from nature. It starts with permission to do so and really comes down to the survivability of the tree once lifted. There is a skill to this as well as the transport and after care of the tree. You need to know the species. Is it something you can lift and transport bare rooted or is it something that you start the preparation a year ahead of the actual removal of the tree?
My general rule is that if I am not one hundred percent sure that the tree will survive or that I do not have the skills to care for that specific specie of tree, then I leave it where it is. Not a fifty percent chance, a one hundred percent chance.
There are many You Tube videos and a lot of information available on the technical aspects of how to do this. I have always wondered about what some of these collected trees look like after a few years. Responsible collectors follow their videos and photos up with progress videos and photos. Probably because they have live trees to show for their efforts. Those are the ones that you want to look at or follow. If you never see these trees again, stay away from these people.
In conclusion, think, plan and over organise your trip. Have all the correct equipment needed and only take what you have permission for and what you can keep alive.
I find myself these days starting answers to Bonsai related questions mostly with “it depends”. This topic will be the same. Your local climate and setup will largely determine what you do with your Bonsai trees during Winter. As most of the Blog readers will rightfully ask about the purpose of this topic this time of the year, the simple answer is that most of the readers are in the USA and I am in New Zealand / Aotearoa. It is Winter here now.
This could be a good example of how local climate can differ. Parts of the South Island and inland North Island, will have snow on the mountains with below freezing temperatures at times. The same will be true for Northern Hemisphere countries during that Winter. It all depends!
Here is a video from a few years back of some of my Bonsai just as it started to snow.
The main things to look out for are:
As most trees will go dormant or at least slow down with the onset of Winter, it is important to make sure that you adjust to the water requirements that comes with this. The main problem is being too wet. This can lead to root rot. The best way to tackle this is to be pro-active by ensuring that all your trees have a well draining soil mixture and that the pot drainage holes are open. I have found many a spider’s nest and snails blocking the hole partially from the outside. Another technique is to place the pot at an angle for water to run off during periods of heavy or consistent rain. Needless to say is that when you are in a high rainfall area is to switch automatic watering systems off during this time. It is as important to check trees regularly / daily for water requirements. Be especially on the lookout for trees that might be partially protected by trees, fences or roof overhangs. The front row of trees might be wet, but those in a “rain shadow” might be very dry.
Frost is the biggest enemy here. It is reported that for some species snow is not a problem as it could insulate the tree from harsher elements like wind. Wind for me is a major problem. Not only does it dry leaves out, but in Winter it causes a wind chill, sometimes far below areas out of the wind. Trees not accustomed to these very low temperatures must be protected. This will include over-wintering in a basement, garage, shed or at least a conservatory of some sorts. I personally do not have many trees with this requirement, but do have a few sub-tropicals, inclusive of Bougainvillea that needs protection. This is done in the form of just placing it under a bench when frosts are expected or using a cold frame. Trees that you work on during Winter, even if it is just wiring, should be kept in a better climatic area for a few days after the work was done.
It is mentioned in the paragraph above that trees can be over-wintered indoors. As deciduous trees will be without leaves, light requirements do not matter too much, but it is important to take note that plants rely heavily on day and night length differences to keep seasonal cycles going. For this reason, indoor trees are usually placed under lights on timers, mimicking the gradual increase in day length hours as Winter passes towards Spring. When it comes to light requirements, the answer of “it depends” is highlighted. Study your plants, increase your knowledge about specific species requirements and adjust accordingly. Winter is a great time to read, study and watch You Tube videos to increase knowledge. That includes reading this blog and visiting http://www.bonsaiplace.net regularly for updates. Best still, subscribe and you will never miss an article.
Clean, clean and then clean some more. Get rid of leaves and everything else that all sorts of bugs can hide under, lay eggs, overwinter themselves and then come out in Summer and create havoc. This is also the time when you can spray to kill all sorts of fungal spores. A weak solution of lime sulphur does the trick. Just, as always, be careful when it comes to Pines when spraying for fungus as it can kill the beneficial micorhiza off in the soil.
In very cold climates most bugs and spores will be killed due to the very cold temperatures and for me the best is the architectural forms displayed by especially deciduous trees without their leaves. En joy this season, it is crucial in the development and normal growth of trees and also learn from your trees. We all need a break at least once a year.
“Art should comfort the disturbed and disturb the comfortable.”
The quote above is attributed to Banksy and it sits quite comfortably with me. How can this be applied to Bonsai as an Art? My own personal experience is that an hour’s work on a Bonsai tree is equal to the same amount of time meditating. One can therefore say that it comforts the disturbed and at the least calms the mind down.
It is quite interesting to watch people at a Bonsai exhibition. There is the initial excitement and almost “cannot believe my eyes” moments, but as they move through the exhibition, a calmness sets in, almost as if you are in a library. I have even seen people talking softly when in the presence of these miniature giants of the floral kingdom. Except for the cultural links, could that be why it is not uncommon to see a Bonsai tree or three near or part of a Zen garden or space?
Not so sure about the disturbing the comfortable part. Maybe that is the bit where you see non-Bonsai people just wanting to get into the art after they have seen Bonsai trees in real life. A real inquisitiveness sets in and it rocks their world. Or is this the bit that forms the basis of Bonsai activities leading to an addiction?
I must say that even seasoned Bonsai people do get disturbed when in the presence of an especially spectacular tree or composition. This disturbance is evident in the slightly angled heads, dead silence even with a few people around the tree and then followed by a lot of pointing and increase in volume as the tree is discussed. You can almost see how mental notes are being made and mental photos being taken to go and copy some of what they are seeing the moment they get home.
I am picking up six raw material trees this weekend and I can feel the excitement building up, a disturbance of my normally very calm inner self. Can’t wait to work on the trees. I do know that when I start the work, the deepest state of calmness will set in. The opposite of the excited, disturbed state is counteracted by the meditative state.
Maybe that is what is in Banksy’s quote, the yin and the yang, the stillness and the turbulence, the Bonsai tree and the Bonsai artist. It is one, it is the whole, it is the two sides of the same coin.
It is a given. You will have a few trees die on your watch. Nobody wants it, but it happens and it is part of the life-death cycle that underpins all living things. We do not kill our trees deliberately and it therefore is important to take note of the things that do increase the chances of this unfortunate event.
This relates to keeping the tree healthy through everyday practices, inclusive of hygiene, watering, light and nutrition requirements.
In my experience watering requirements is the most important of these aspects. Get that wrong and your tree will deteriorate and then just die. This relates to both overwatering as well as too dry conditions. Every tree will have different requirements based on species, soil medium, size and exposure to sun. Study this for each specie, make notes, learn and apply. Overwatering is the dangerous one as it generally leads to root rot and by the time you become aware of this it is too late. Be aware of irrigation systems. A power outage, a flat battery or a broken pipe, all lead to disaster. The best way to water is by hand and by studying each tree and adjust the amount of water to the daily requirements. It is labour intensive, but a safe way to keep your trees alive.
When repotting, pay special attention to the roots. Some species do not handle complete removal of soil well. Check for tangled roots, check for bugs, caterpillars and ants nests in the soil at this time.
Seasonal and Climate requirements
At the time of writing this, it is winter in New Zealand and after quite a dry period, it has now been raining for three days solidly and the temperature has dropped into single digits in places. Irrigation systems are now turned off and the focus now shifts from preventing trees from drying out to ensure they do not drown. Half of my trees now have pots at an angle to allow water to run off, rather than sit in the pot. Back to basic horticulture as your soil medium and its drainage ability now plays a big role in keeping trees healthy and alive.
I have mentioned temperature and the accompanying conditions now come into play as well. Snow can actually insulate trees, but frost is just nasty. Your local climate and specific species will dictate if a tree needs to be under cover or not. Frost has killed many a tree. Very harsh high temperatures, accompanied with little to now sun protection and not enough water will kill trees. Take note of your pot and soil temperatures. The pot construction, size and colour can have an effect on the temperature inside the pot. Two pots next to each other can have very different temperatures.
Be careful when bringing plants inside, especially non-dormant trees. I have seen and heard of many trees that just did not like artificial heating systems, wood fire burners and even being cooked on a window sill, resulting in the tree ending up on the compost heap.
Light requirement of a tree is a big one. Suitable species for sunny areas are Celtis, Junipers, Chinese Elms, Cotoneaster, most Pine species, Holly, pyracantha and others. For a more shady aspect look at Azalea, Maples, Beech, Zelkova and others. Acclimatisation plays a big role here. You can gently and over time get some species to tolerate a wider range of light and temperatures if your care is spot on. Generally, if you get this wrong, a tree will deteriorate over time and if not corrected will say goodbye.
This is not just a beginners issue. Many a tree has succumbed to being overworked. The safe mantra here is do little bits of work more often, rather than massive root work at the same time as huge pruning and styling jobs. This goes with seasonal changes as well. Certain things, like defoliation, should take place at a specific time of year. Same for root work and repotting. It could be different for different species. Study, learn and apply.
Diseases and Pests
That is self-explanatory. The best is to use preventative methods to stop disease and pests from getting to your trees. This could include preventative sprays, either organic or not. That depends on your philosophy, but either way, keep an eye out for tell tale signs. Things like ants can point to aphids, sooty mould and other issues. Yellowing and spots on leaves, droppings of bugs and caterpillars, chew marks on leaves, sudden leave drop, are all signs of things going wrong. Keep an eye out and this can easily be combined with your daily watering routine. A big part of prevention is basic hygiene around your trees. Get rid of fallen leaves, clean underneath your benches and check the undersides of pots. Many an issue can be prevented by just cleaning often.
Seal wounds, tie trees down in pots when repotting, check old wounds, look for new holes in the trunk, marks like ring barking and especially underneath the leaves.
This is just a snapshot of things that can go wrong and is not intended to scare or put Bonsai enthusiasts off, just a reminder that a Bonsai tree is like having a pet. The tree has basic requirements and if these are not taken care of, it will deteriorate and can then die as a result of neglect or just not being bale to pick up on adverse things early enough. The solution is to arm yourself with knowledge, practice the skills involved in keeping a tree alive and constantly take great care of your trees.
Photosyntheses — the process through which plants use energy from the sun, water from the soil and carbon dioxide from the air, to produce food for itself and then also oxygen. From this, we see that it is really important to get the light requirements of your Bonsai trees right.
Phototropism – the phenomenon where plants grow towards light. This is mainly caused by hormone stimulation that forces plants to grow towards the light source.
Too little light can cause issues and then you also have the other side of this continuum, the heat caused by direct sunlight, that can also cause harm.
Let’s look at situations where the tree is in the shade too much. This could cause a deficiency in energy production, unless it is a plant adapted to grow in shade. Shady conditions can also cause leaves to grow larger and then also for branches and especially new growth to become spindly with very long internodes. Both of these growth patterns are not very good things for Bonsai where you need smaller leaf sizes and also more compact growth.
Another light consideration is where you place your Bonsai trees in relation to the light source, i.e. the sun. Plants tend to grow towards the sun and if placed against a wall, it could be that the tree will grow away from the wall. It is also possible that you will have very little growth on the shady or wall side of the tree. The solution to this problem is to turn your trees often. Some of my trees, that are on stands / monkey posts with no wall near them, quickly show me that they need to be turned as well. It could be slight yellowing of the leaves or needles on the southern side (I am in the Southern Hemisphere) or denser growth on the sunnier side than the shadier side.
What is the most important here is to know more about the natural habitat of your trees. If it is a natural shade lover, you could get the opposite to what is described in the previous paragraph. Also look out for burn or scorching of these shade lovers on the sunny side.
Think about the placement of your trees. Study the different microclimates that can be caused by high walls or fences as well as trees and other plants. The construction of your display stands and where these are placed in your garden are all very important aspects of your Bonsai cultivation. When it comes to the regular turning of trees, I have a fixed day twice per month and I turn the tree through ninety degrees, always in the same direction (for me that is clock-wise). Sometimes I will keep it longer in a specific position due to the fact that there could be an undeveloped branch that needs the light source for longer to get its development up to speed.
You also need to think about the light requirements when it comes to specific maintenance tasks. After root pruning or repotting it is also best to keep your tree away from direct sunlight for a few days to a couple of weeks. The opposite when you get into the different grades of defoliation.
One of the reasons for defoliation, whether it is fully or partial, is to stimulate back budding and for this, more light is needed.
If you are heavily invested in Maples as Bonsai, it will be worth your efforts if you look at different light requirements of Maples as it can influence stunning Autumn colours and even new colours in Spring. That is a topic for another day.
It is not complex, but certainly something to think about when you position your trees and every time when maintenance tasks are undertaken.
The aesthetic and monetary value of a Bonsai tree is determined by its health, shape, size, age and these days the celebrity status of the artist. All of these, accept for the last one, can be enhanced through proper care which includes shaping, pruning and pinching as developmental techniques.
There are a few reasons why Maples should be pruned or trimmed. Developing structure is a big part of this and then culminates in developing good ramification and a pleasing shape. The different phases depends on whether you are working on a seedling, a well-established tree or a tree that was field grown and in its early stages of development.
The seedling or young plant is the easiest as it can still be bend in a suitable shape and very little cutting is needed until later. Use wire for this bending. At this young stage it is important to develop the basic structure and to leave as much growth as possible to feed the trunk.
The more advanced tree will have its main flow established and the emphasis is now on branch development according to the desired style and shape. The great thing about Maples is that you can cut a whole branch off and in a few years’ time you can grow a new branch in a more suitable place or with more movement in it. This is where patience comes in.
This is also the time to remove unwanted growth such as bar branches, crossing branches, branches that do not add to the aesthetics of the tree like branches growing upwards and downwards, interfering with layers above or below it.
Once the tree is established and with a desirable structure and flow, you start to refine the secondary and tertiary branches by either trimming back to a couple of leaves or by using the pinching method. This enhances ramification and forcing the internodes to be shorter. Defoliation is part of this strategy and this also helps to reduce the leave size.
I also do believe that deciduous trees, like conifers need to have the energy throughout the tree balanced. Apical dominance plays a big part here. Sometimes lower branches become weaker. This can be due to the top of the tree growing too vigorously or just because the lower branches are shaded out by the upper branches. By removing some of the upper leaves or just reducing them in size by removing about half of the leave, more light is let through.
The Timing of Pruning
The best time for structural pruning and shaping is early to late spring as the tree is getting out of dormancy and will be full of vigour to get growing again. Heavy pruning or shaping should not be done around repotting time when large quantities of roots are removed. A lot of the trees energy is stored in the roots and when this is removed, new growth will be jeopardised. If you are not going to remove a lot of roots during repotting, pruning can be done at least two weeks before repotting.
How to Prune
For structural pruning, use sharp cutters and seal the wound with sealing paste or something similar. You want the edges of the cut to be clean and not torn. Hollow the wood in the cut a little bit by using knob cutters (rounded blade) or even a Dremel tool. The cambium (thin green layer just under the bark) needs to be kept moist and healthy (that is what the paste is for as well) to allow it to grow and roll over the wound and after time, sealing the wound off for a natural appearance.
The main reason for pruning throughout the growing season is to keep the internodes short, the leaves small and the most important one, increasing ramification. It is also used to create layers or foliage clouds by removing upward and downward growth.
The main refining method is trimming, supplemented with pinching in more established trees. The general convention is that you will prune back to two or four pairs of leaves. This is done when the new branch has extended to three or more pairs of leaves. Sharp scissors are used to cut through the central shoot and leaving a short part of this shoot still intact. Maples do die back where a cut is made. By leaving a short stalk, the die back will not affect the buds from where new growth will sprout.
Pinching is used on well-established tree and is a refinement technique. The new leaves are removed just as they start to unfurl, as early as still in their embryonic stage. If there is a specific area where you want denser growth, remove the leading shoot as well as the two side shoots. The finer leaves will have finer twigs and this all adds to refinement and better ramification. This is what gives deciduous trees and especially Maples, the great silhouette during Winter time when the tree is without leaves.
Large leaves can be trimmed off at any time. As mentioned before, this will allow more light to penetrate through to the interior of the tree which in turn will cause more back budding to occur.
Defoliation can take place by mid-summer as long as you still have a decent length of growing season ahead. As mentioned, this will lead to smaller new leaves growing and will also help to allow more light to penetrate into the tree. This can be done by removing all leaves. Only do this when the tree is healthy and you have good weather conditions ahead. It will take up to three weeks for leaves to grow again. Defoliation can also be used to balance the energy and growth across a tree. If a specific branch is lagging behind, partial leave removal on that branch can help to invigorate the branch. This method is not as invasive as complete leaf removal and allows the branch to grow new shoots. I personally prefer to defoliate over two weeks. I do the lower branches first and then over the next two weeks move up the tree until done. This is less stressful and balances leave growth across the whole tree.
Think about and plan structural pruning as well as refinement pruning and pinching.
The health of the tree always comes first.
Use sharp and clean equipment for cutting and pruning.
Prepare and clean cutting wounds.
Always use cut paste on larger wounds.
Keep the big picture in mind.
Make cuttings of the prunings.
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It is universally understood that old tree trunks and branches mainly consist of wood and not much of the softer stuff. To copy or create age in Bonsai, it is therefore desirable to have as much wood and bark as possible. These things do come with age and is very desirable in Bonsai, especially the bark, as that is the most visible part on trunks and branches and even on exposed roots.
So what is wood? If you start peeling off the outer layers of a tree trunk or branch, you will find two kinds of wood underneath these top layers. Closest to the bark or outer layer is the sapwood. This is moist and a living layer consisting of the xylem fibers. These are tubes which help the tree to transport water and nutrients from the roots to the leaves. The mechanism for this is explained in other posts on this site.
Underneath this layer, you will find the harder layers called the heartwood. This is dead material and basically consists of the xylem tubes which are not hardened by resins and no longer transport water and nutrients. This is the wood of the tree and is easily recognizable by the annual rings.
Back to the external layers. On the outside of the sapwood you will find the cambium and this is where the growth takes place, thickening the tree and the source of the annual rings. On the outside of this, you will find bark forming. This is basically just the original epidermis (outer layer of cells of a young plant) that undergo chemical and structural changes over time to form the woody or corky dead tissue that we know as bark. This is brittle and not well fastened to underlying layers.
One of the important things to remember for Bonsai is that when we bend a trunk quite severely, you might here a bit of cracking going on. This is usually the deadwood and as long as you do not snap it completely, it does not interfere with the living parts of the tree, merely the structural bits. What you need to be careful of is to not break the outer layers too much as that is where the water and nutrients are being transported through.
To form a permanent bend in a branch or trunk, the wire will assist to keep the branch in position for the resins and dead fibres in a tree to settle in the new position and then hold it there. This is why you need to keep the wire on for a s long as possible, but at the same time be careful of the outer layers still growing and growing around the wire. Technically it is not the wire biting in, more a case of the outer layers growing around the wire.
We also have to be very careful with the bark. As it is an outer layer and not very well attached to the underlying layers of a very old tree, it can come off very easily. As pointed out earlier, it is desirable to have the bark on trees like oaks, redwoods and others, it needs to be protected. A few things to do is to never pick a tree up by its trunk, cover the bark with rafia when applying wire and protect the bark with sifter material when using guy wires.
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