Planting Hibiscus in the Ground-Zone 8
Can I cut the hibiscus back and mulch before winter months in this zone with good results?
Certified GKH Gardening Expert
You can, but really the best time to cut back hibiscus is spring. This article will help with that: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm
As for winter protection, a good layer of mulch should be plenty in your area, as long as what you have is a hardy variety and not tropical.