2. Too much or too little nutrients in the soil 'Rose of Sharon plants prefer acidic soil, generally with a pH below 6.5,' continues Tricia.

Rose of Sharon doesn’t require pruning to grow and flower well, but annual pruning helps regulate the fast-growing large shrub or small tree. Regular pruning also boosts the size of the shrub ...

Rose of Sharon is an upright shrub, perhaps 8 to 10 feet tall. It's not a delicate shrub, fine with twigs, but one with branches that are relatively thick and few.