The complete history of this bonsai is attached here. I shared a few photos of my Katsura Japanese maple, Acer palmatum ‘Katsura’ in my original posts in Facebook and the Bonsai Nut Forum. Katsura Japanese Maple 2010 after growing in the garden for a few years.
Sometimes the fine delicate twigs are not as winter hardy as thicker branches. The subsequent new growth can be trained for different purposes. Aftercare is important considering sun exposure, watering and fertilizer applications. I’ve actually defoliated maples in August with good results, but do not recommend that late a date. Timing is important to allow the new growth to mature before cold weather arrives. I recommend that the foliage matures and trees are fertilized before defoliating in late-spring and summer for maximum results in developing a new flush of growth for training or display. Both Are The Same Age, My 40 Year Cuttings. June 2020 Katsura Japanese Maple Defoliated Bonsai And Garden Tree. Undeveloped trees can generally withstand more stress than more developed trees. The health, age, size, stage of development, climate and reason for defoliating a tree must be carefully considered, especially with established developed specimens. There are numerous reasons for defoliating deciduous, and even broadleaf evergreens, such as for increasing the number of twig ramification, reducing leaf size, transplanting out of season, reducing vigor on developed trees, energy balance, preparing trees for exhibits, improving air circulation and sun, improve autumn coloring, enjoying colorful spring shoots again, facilitating easier wiring, reviving dehydrated trees, eliminating pests and disease and more. I’ve learned through intense study (both in the US and Japan) and actual practice for well over 50 years that plants, especially Japanese maple cultivars have diverse growth habits and respond differently to bonsai training techniques.
I must have skipped the defoliation chapters in the books studied. Unfortunately, I did not study with Ryan, whom I respect, and others. Today I’ve been told that Ryan Neil and others do not recommend total defoliation of healthy maples. Although defoliation is “generally” recommended as a bonsai training technique it actually requires considerable thought and it’s necessary to contemplate each specific tree and the purpose of removing foliage.
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