If you had containers and simply sawed them in half,
as with a serrated edge steak knife, and did not go teasing the roots
apart...keeping them together carefully, you could get away with that
kind of division. it is when folks tease the roots apart that they
start to do real murderous harm.
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Not to mention near impossible. The pot bound Bory that we got a
while back had almost zero dirt in the pot and hopelessly tangled.
The only option we had was to hack and slash. I fear I may be having
my first sleep/creep/leap situation :-/

Chris
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That was the Bory you got from us? because we have many pots which are
BULGING with compressed roots. it is better to slice them up like a
tray of brownies; teasing roots apart damages them all, but if you
cut, you damage ONLY roots which are being cut.
Sleep/creep/leap is what bamboo does best, you must be doing something
very right.
hermine