Do I do it before bringing it in for the winter?
My Hibiscus Tree Is 3 Years Old and I Want to Trim or Cut the Branches.
Certified GKH Gardening Expert
Yes, if you are bringing in a potted hibiscus, you can cut it back by up to 1/3 before bringing it indoors. Otherwise, you should wait till spring. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm