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Personally? None. Books show neatly pruned Bonsai in pots with immaculate roots. And I think that is a shame, because there really is little info on this subject out there.

You can find all the horticultural info on any plant easily, but very little on root pruning. And having to prune a root bound nursery plant is about the first thing you encounter when starting out in Bonsai and an easy way to kill your tree if you don't know what you are doing.

This thread is already well on it way to become the most comprehensive info I've found on the subject.

Take places like BCI or Bonsai4me, all have good info on plant culture, pruning, watering, soil mixes the usual, but nowhere do you find any info on how severely you can actually root prune a given species.

And then the quality of the info you do find. Compare at least three website and then try to figure out what in all the contradicting statements can be applied to your own situation, figure out how things apply to your climate & growing conditions, and maybe just maybe you walk away with something useful.

hm, sorry for the rant...
I'm slowly starting to realize just how much experience and simply knowing your own trees are actually worth.

Stefan

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Never let your sense of morals get in the way of doing what's right. - Isaak Asimov
The most savage controversies are those about matters as to which there is no good evidence either way. - Bertrand Russell