chong

Good point Kyle. However, most bananas do not have to have them. Natural dormancy is just a characteristic that allows them to survive in cyclic unusual conditions. But if the condition does not occur at the particular time, it doesn't mean that they will go into dormancy anyway.

Bill - If you have bright indirect outside lighting available, that should be sufficient to allow the plant to continue growing. However, depending on the intensity of the light, your plant may become too spindly. If you want them to grow as close to normal as possible, add some supplemental lighting. It doesn't matter what kind, because the exterior light will sort of balance the spectrum to a large extent. But for energy usage, fluorescent lamps will be adequate, especially if the outside light source is reasonably bright. High pressure sodium or metal halide lamps may be overkill if you only have a few plants.