Rose of Sharon (Hibiscus syriacus) grows in a vase-like form in well-drained, sunny locations. The flowers bloom from summer to late fall and come in shades of pink, purple and white. Left untended, rose of Sharon shrubs produce plenty of small blooms to add color to the landscape.
Prune the rose of Sharon in the early spring before the growing season begins. When rose of Sharon is not pruned, the shrub produces many small blooms. Pruning results in larger blooms, but fewer in number.
Water rose of Sharon bushes generously during the growing season. Although established plants withstand drought conditions, watering helps keep the rose of Sharon blooming throughout the summer.
Mulch rose of Sharon shrubs before heavy frosts hit the growing area. Remove any dead or diseased stems and branches while mulching. Also remove any starts growing at the base of the shrub to keep the bush from becoming invasive. These starts may be transplanted to other areas of the landscape.
Propagate rose of Sharon bushes by stem cuttings taken in early spring before new growth forms. The rose of Sharon also grows from seed, but stem cuttings speed up propagation.
Treat any leaf disease or insect infestations immediately with a quality fungal powder or insect repellent. According to Ohio State University, older rose of Sharon shrubs become susceptible to trunk cankers. Left untreated, the canker may cause the shrub to die.