Answer: Photinia can be propagated by layering or tip-cuttings. The simplest method would be layering, and in-fact, it may have self-layered already. Look around the base of the plant for new shoots presenting themselves. If you gently dig down you may see it can be cut from the main plant. It will have a stem and root attached. After you cut the attachment, dig it up and plant it where you wish. Or, you can layer it by bending a long stem, gently placing it under the surface of the soil (while still attached to the mother plant). I always put a large rock on top of this location to hold the stem there, and also to identify where I am working on a layering project. Leave it like this for a growing season and then, being sure a root has formed, cut it from the mother plant, dig the root up gently and plant it where you would like. Layering should be done in early spring.
You can also take tip cuttings in mid-summer. Simply cut a 4-6 inch length from a growing stem, strip off the lower leaves, dip the cut end in rooting hormone and set the cutting in a pot of moistened potting soil. Place the pot near the parent plant and water when the soil begins to dry out. The cutting should root in 4-6 weeks.
Best wishes with your project!
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