I need to share a part of my hibiscus plant, which is pretty big now, with a friend. When is a good time? We live in northeast Maryland.
How Do I Split a Hibiscus Into Two Plants
Certified GKH Gardening Expert
Unless they are "growing" by putting out suckers (stems from the ground), you cannot divide them. However, some types of hardy hibiscus can be divided if there is more than one trunk or stem, and this is usually done so in spring by cutting the plant in half. Stick a shovel in the middle of the plant between the stalks and cut straight down into the root ball. Then dig out from around the plant (about a foot around). Pop them up out of the ground and then replant.
If you simply wish to share a pice of the plant, the overall majority are best propagated through cuttings. This article will help with that: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-propagation.htm
If the plant is getting too large, you would be better off pruning to control the size. This article will help with that: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm