I have a banana tree that is in a pot and I have it indoors for the winter. It is about 4 ft. tall. Each day it is leaning over a little more and soon it will be a real problem if I don't do something about it. It is leaning away from the window, so I don't think light is the problem, but maybe it needs more water??? Or should I fertilize it? I appreciate any insight you can give me. Thank you.