Most of my bananas, and some other plants, are kept growing over the winter, either in bay windows, or under lights, in a warm basement. The basjoos, in the ground have bags of leaves up against them,. and the whole thing is covered with a tarp, to keep them dry.
Last year, I took some of the basjoos that were in pots outside, out of the containers, shook most of the soil off the roots, and put them in a black garbage bag, with another bag over the tops, in a cool room. (about 50°F) I did this in the beginning of November, and uncovered them, repotted, and put them outside on April 5th. They were untouched all winter; they got no water at all. After placing outside, they started growing again, in a week or two. All in all, a very successful operation.
This year, I didn't even take them out of the pots; just moved them into the cool room, and put bags over the tops, again in early November. Like last year, they got no water at all. I peeked under the cover today, (March 14) and this is what I found:
http://[url=http://www.bananas.org/gallery/showphoto.php?photo=40794&ppuser=826]

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