There are three good ways of propagating a plant: growing one from seed, grafting a cutting to a different set of roots and starting a plant from a cutting. Starting a plant from a cutting is one of the easiest ways to propagate a hybrid, since grafting plants to root stock can be tricky, and seeds will not reproduce true to type. Plant cuttings produce hearty shoots that have all of the parent plant's strengths.
Wait until late fall when there are no flowers on the plant that you wish to cut, or select branches from the parent plant that have not produced flowers.
Cut at least 6 to 8 inches from the tip of the branch or cane using a sharp grafting knife. Make your cut at a 45 degree angle just below a plant's node (the point at which the leaves emerge from the branch).
Strip the leaves from the lower half of the cutting.
Immediately dip the end of the cutting into rooting hormone. Do not let the cutting dry out.
Fill a sterilized potting tray with sterile potting soil.
Insert the cutting into the potting soil so that the stem of the cutting is buried to the halfway point.
Mist the cutting and soil with a plant mister until the soil is moist.
Cover the potting tray with plastic sheeting to keep the moisture in the soil.
Store the plant in a heated room out of direct sunlight
Continue to mist the soil and the cutting to keep the soil damp for two weeks, until the plant has developed roots.
Water the plant from a watering can once it has developed roots.
Remove the sheeting and transplant the plant to a larger container as the roots develop and the plant grows.