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You can prune out undesirable culms at any time. However, you do not want to be fertilizing -- and thus encouraging new growth -- until later on in spring when you don't have to worry about freezes. If you get another freeze, it's likely that you will lose these new shoots. Maybe if they're not too tall when that happens, and you mulch heavily, you could improve the survival rate.

How much one is supposed to fertilize moso or any other bamboo in (lb/square-yard/year)?