Rose of Sharon needs no special care—no need for fertilizers or extra watering (except immediately after planting). Because of its rapid-growth, self-seeding capability and no help from humans to survive, Rose of Sharon can become invasive. Use Rose of Sharon to create a tall privacy hedge-fence. Rose of Sharon can reach a height of 12 feet and a width of 10 feet.
Pruning and containment
Another option for pruning a Rose of Sharon is to remove about one-fifth to one-third of the lower branches, giving it a tree-like appearance.