If the tree is not "pot bound," repotting can be delayed. For example, if there is as much as 1 or 2 inches of soil around the rim of the container that is not filled with roots, then repotting can be delayed one to two years longer.
Bonsai requires repotting when they develop into pot bound. A Bonsai is considered to be rootbound when its roots entirely fill the pot and there are long roots circling the rootball or inside of the pot.
If necessary, ie if the bonsai is becoming pot bound, re-potting can take place now instead of the following Spring.
If the tree has started to become pot bound, with long roots growing around the edges of the pot, then it is time for repotting. Try to avoid allowing trees to remain pot bound for several years.
I acquired the tree from a fellow bonsai enthusiast in a rather bushy and very pot bound state in 1999.
Re-potting & Growing Medium: Plumeria don't like to be pot bound, so repot younger plants every year. Use a well drained soil to avoid root rot. 1 part Akadama, 1 Part Pumice, 1 Part Bark chips.
This example bonsai tree started neglected and pot bound, it had been left against a fence and all the back branches had died off leaving front and side only.
Options at this stage were wind swept or raft.
Plants roots continue growing, even when a plant like Bonsai is in a small container or pot. When the roots become pot bound, then the bonsai needs to be (more.)
Bonsai Marketing ...
Pests an diseases: Red spider mite is common. Also, bamboo easily becomes pot bound.
Some species suitable for bonsai: ...
If your plants seem to dry out more quickly than they used to, but are otherwise healthy, they are probably pot bound. There are simply too many roots in the pot and not enough soil is left to hold and distribute water.
 See also: Bonsai, Grow, Pot, Growing, Light
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