Known for large, showy blooms late summer into autumn, Rose of Sharon (Hardy Hibiscus) is a cold-hardy deciduous shrub that gets going just when other flowers start to fade. Flower colors range from white to shades of pink and magenta to blue. These gorgeous shrubs can grow up to 10-12 feet tall and about 6-8 feet wide. Grows best in full to partial sun in evenly moist soil. Once established, they're simple to care for. When it's time to prune, do it in late winter or early spring, as Rose of Sharon blooms on the current season's growth.