Cut 4-inch lengths from the tips of nonblooming stems, making sure each includes two or three leaf nodes.
Combine 50 percent peat-free compost with 50 percent sand to use as a potting medium. Then fill small pots with drainage holes or a nursery flat with this mixture and water well, until the medium is saturated and water runs from the drainage holes.
Make planting holes about 2 inches apart with a pencil or screwdriver, and then insert one cutting in each hole. Pack additional planting medium around the base, pressing it down lightly to secure your cutting.
Keep your cuttings in a shady area where the temperature remains 64 to 70 degrees Fahrenheit and the humidity is greater than 50 percent. To facilitate rooting, use a plant heating pad under your pots or flat.
Transplant rooted cuttings into 4-inch pots after four to six weeks. Use a standard potting soil and keep the soil moist.