One of the joys of rose of Sharon bushes is that they can be propagated just by taking cuttings and planting them in the ground. It isn't as easy as making a few cuts and sticking the stems in the ground, however, so careful planning and preparation are a necessity. By taking your time in preparing your rose of Sharon cuttings and the soil they will grow in, you'll not only increase your success in propagation, but also can propagate more plants to give to others or to fill your garden with.
Take cuttings from the rose of Sharon in fall, after the leaves have dropped. Each cutting should be 9 to 12 inches long and about the diameter of a pencil. Make the cut just before or after a bud.
Select an area to grow your cuttings which has good drainage and is shielded from wind. Typically beside a wall or fence works well, but you can also a cold frame.
Loosen the soil to form a trench 6 to 8 inches deep. Break up soil you remove as much as possible. Fill in the bottom of the trench with 1 to 2 inches of sand or perlite.
Insert the cuttings vertically into the trench, spaced about 4 inches apart. Push the base of the cuttings well into the sand. Fill in the trench with the broken up soil to bury half to two-thirds of the up the cutting.
Water the cuttings regularly for the first month. After that, keep the area weeded and watered when needed through the winter, the first growing season, and through the second winter.
Transplant the cuttings to their permanent home during the second spring. If some of your cuttings seem to be doing better than others, leave the weaker ones to grow for another season, transplanting them the following year.