I have Bower vines growing in window boxes on my deck. These are the white ones with dark pink throats. Anyway, I want to bring them in thru the winter, but don't know if I should cut them back, take them out of the box, (it's a huge deep long custom made box!) and store them in the basement like dalahia bulbs or what. Or, can I cut them from the trellis, cut them back short, get them into pots, and bring them in as house plants until spring? I really love these vines. Help!