As I said before, there are many possibilities, depending on your zone and climate variables. It would be nice to have a heated greenhouse, to be sure, but the cost to heat one in a northern Central Plains location for an entire winter would be prohibitive for most growers. Hence the many creative approaches to digging and over-wintering. Being soft tissued, mostly water by weight plants, bananas don't tolerate cold, humid conditions very well, making storage difficult, but not impossible. As noted by several others, it is all about creating suitable conditions to avoid the dreaded soft rot until warmer temperatures return. More than just a hobby, growing some of the tropicals in less than tropical areas is a major challenge, successfully achieved by a lot of hard working and creative growers who just won't accept the notion of "can't".
