My hibiscus plants are about 3 ft. tall.
My Hibiscus Plants Are About 3 Ft. Tall
Certified GKH Gardening Expert
Your question appears rather vague but I assume you are asking about pruning due to their height. If these are potted and you are bringing the hibiscus inside, you can cut them back by up to 1/3 before bringing the plants indoors. Otherwise, you should wait till spring. This article will help: