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First of all, prepare an appropriate pot for your tree. The plant should be relatively dry around the roots. The Bonsai tree should be taken out of the pot, the dead roots should be removed and, around the main root, you should cut the longer, thinner ones, and let only the compact part of the root.
Preparing the pot
Now, prepare the new pot. Cover the holes in the bottom of the pot with some wire netting, to keep the soil in the pot. Put a drainage sand layer at the bottom of the pot. This layer should be 0.3inches/1cm high with smaller pots and up to 1inch/3cm with bigger pots. The pines need drainage layer of at least 1inch/3cm. You can add some soil over this layer, so that the Bonsai tree may be properly placed in.
Putting the tree
Now, you should put the tree in the pot and find the right position for it. Then, you should use the wire to make sure the tree doesn’t move. Finally, when you are happy with the position and the inclination of the tree, fill the pot with soil. Stamp the soil well, to surround the roots very well and, finally, water the soil.
Above the soil, you should add a small layer of clay. In about 1 year, a layer of moss will appear that will develop in about 2-3 years. Another possibility is to take the moss and dry it out. IT will be then mixed with Japanese clay (Akadama). Then, put the moss over the soil and, in the next months, water the plant carefully, so the layer of moss should not be too moist. The moss will grow up very quickly.
During the years, you can keep all the used Bonsai pots. Before reusing them (if you choose to), clean them well at the inside and at the outside, because they would probably contain parasites and fungus that would harm the trees.
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