While rose of Sharon can withstand some light pruning in early spring, it does not grow well when continually trimmed to stay small. Cutting your rose of Sharon throughout the growing season will lead to reduced blooms and an overall stressed plant. Instead, we recommend selecting varieties that naturally grow smaller than the rest. Pollypetite is a dwarf rose of Sharon reaching 3-4 feet tall and wide. Purple Pillar and White Pillar grow tall but have a narrow habit. They can reach 16 feet tall but only grow 2 feet wide!