The care of hibiscus then turns to water needs. Until the hibiscus is well established, they need lots of water. Try to keep them constantly moist. After they are well established, they can tolerate both dry and moist conditions. Hibiscus plant care then should turn to accounting for fertility. Fertilize each spring with 10-20-10 formulation or an organic fertilizer.
The winter season is the next consideration for successful hibiscus care. Hardy hibiscus can be trimmed back to about 12’ above the ground after a killing frost. Once the soil is close to freezing solid, they should be heavily mulched. Pile the mulch at least 12’ deep.You can cover the mulch with snow to provide even more insulation. They need to be kept cold, not frozen or warm.
In summary, hibiscus care is relatively easy. After planting on a good site, water and fertilize and provide winter protection. If you want to encourage better branching, pinch them lightly early in the growing season. They should not need pruning unless they get too large for their area. Once the new shoots have emerged in the spring, you can prune out the old stems.