Jeff zone 8 N.C.

Just like other bananas the corm will form. If you mean by "pruning", you are referring to the removal of leaves, I always leave any leaf with any amount of green, at all, on the plant till it completely dries. I think banana plants pull resources from those leaves as long as they have any life left in the leaf. I will usually save dead leaves to use in the bottom of the pots when I pot up new bananas.