i live in zone 7 and i dig mine up every winter and wrap the root ball in plastic so i can water them about once every 3 weeks, i cut my 18 foot trees down to about 5 feet. and store them in unheated garage. if we dont have a very bad winter they try to keep growing. so i will water less so they will sleep through winter. not much less tho.
hope this helps.
hope you have a
blooming good day
darlene

The banana "trunk" is a pseudo trunk formed by the base of the leaves. As long as you don't cut the corm severely and keep it lightly moisted, new leaves will grow from the corm once the plant is exposed to the right temperature and moisture.

Omar