Experts and BHG readers answer.
two shrubs growing together
To root cuttings from your rose of sharon (also called shrub Althea and Hibiscus syriacus) take six-inch cuttings in June or July. Remove the leaves from the bottom two inches and dip the stems into a rooting hormone. (You can buy rooting products at the garden center.) Fill four-inch pots with a lightweight potting mix and poke one cutting into each pot, two inches deep. Set the pots in a shady spot outdoors and water them throughout the summer. In the fall, carefully transplant the cuttings into the garden, water them, and cover them completely with straw mulch or fallen leaves during the winter months. (If you have a cold frame, you can just slip the pots into the cold frame for the winter and avoid the transplanting until spring.) By next spring, they should be completely rooted. Rose of sharon tends to be one of the last shrubs to leaf out in spring, so don't be disheartened if they're delayed. Give them a little extra attention next year, watering them if temperatures get hot and dry.