The rose mallow, or hardy hibiscus, is a perennial that dies back to its roots at the end of the growing season. The most successful time to transplant a hardy hibiscus is when ground temperatures start to warm and new growth begins.
Prepare the planting site
Dig an 18-inch hole approximately 2 feet in depth. Mix the removed soil with equal portions of compost and peat moss.
Dig the rose mallow root
Dig a 12-inch radius circle around the hibiscus root. It's often necessary to cut through some of the roots, which may require your full body weight on the spade.
Fill the hole with soil
Use the soil mix to fill the hole to ensure the plant remains at approximately the same depth as before. Place the root on top of the loose soil. Place the roots in the hole and top with the soil mix. Press with your foot to compact the soil.
Improve water retention
Build a small dike surrounding the plant using the excess soil. The dike serves to catch and retain rainwater to supply the needs of the roots.
Place the end of a water hose inside the dike once the transplanting process is complete. Adjust the water to fill the space without overflowing and continue to water for an hour to ensure the new transplant has adequate moisture.