I have two potted tropical hibiscus that I have to bring in the house soon. One is a bush, the other is a standard about 3 ft tall. The temps are starting to get consistanly cooler and soon (hopefully not too soon!) we'll be getting frost in the mornings. I have never had hibiscus before and they need to be repotted before I bring them in for the winter. Do I need to prune them now or do I wait til they go back out in the spring? I bought insecticidal soap to spritz on them before they come in, don't want bugs in the house.