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For most purposes there are three sizes with which you should be familiar, Small (the Japanese word is 'mame', or palm of the hand), usually two to six inches tall. Medium (or 'shohin'), up to ten inches tall. All the larger bonsai up to four feet.
If you are happy with the height, trunk caliper, and branching of your small tree, it is suitable for mame immediately. A three to four inch bonsai pot less than one inch deep will be the most suitable. Late winter and early fall are usually the best seasons to shift your small tree to its bonsai pot.
Your tree may be wired, pruned and otherwise shaped, but should not be allowed to get very much larger, unless you decide to change its design. Mame require diligent pinching and pruning to keep them from outgrowing their pot. They should be root pruned and repotted once a year, or more for faster growing species.
Trees intended for shohin or any of the larger size bonsai should be immediately shifted to a one gallon pot without disturbing the roots, except to slightly loosen them. Allow some time for your tree to acclimate to its new environment by giving it only morning sun for a while, slowly moving it to a brighter location suitable for the species. Dormant deciduous plants may be placed in full sun, or overwintered in the dark if they need to be protected from freezing.
Let them grow without any pruning at all the first season. This will give you the fastest root growth and insure that your plant will be well established prior to any training. You may begin pruning, wiring and training the following fall. For shohin, this may give you enough trunk caliper, or you can decide to let it go another year for a more dramatic trunk. If the tree is becoming root bound shift it to a two or three gallon can. The object is to grow it as fast as possible. You may continue to wire, prune and shape your shohin as it grows, but be aware that the more you prune, the slower it will grow.
If you desire larger bonsai shift your tree to a five gallon can or into a prepared bed in the ground. Do this as soon as it develops an intact rootball in the one gallon can, usually the first fall, or at the latest, the second. Do not allow your tree to become rootbound, it will slow it down and perhaps cause later problems due to circling roots.
Many of our one gallon size trees are sufficiently developed to be root pruned and repotted immediately as shohin IF the season and the species will permit it. Plants received in the fall and early spring (before the sap runs) can usually be root pruned and repotted. It is always safer to delay root pruning and repotting to a bonsai pot until the next opportunity. This will allow your plant to overcome the trauma of shipment and to acclimate to your area.
Trees destined to be larger bonsai may be immediately potted to a larger size in almost all cases, but should be kept from sunlight and temperature extremes until they can acclimate.
If you want to make your own premium mix, use one half fir or pine bark (particle size from 1/4 to 1/2 inch with NO fines) and the other half coarse inorganic material. Up to ten percent peat moss and/or vermiculite can be added if you desire additional water holding capacity. Water should drain through your mix as fast as you can put it in. These mixes will require close monitoring because they dry out very fast. The advantage is that you will get very good root growth from the increased aeration. Regular fertilizing every two weeks during the growing season is a must. Use a soluble one such as Peters or Miracle Gro. Whatever fertilizer you use, make sure it contains minor and trace elements. If you live an a hard water area, try using an acid forming fertilizer such as Miracid.
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