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Air layering is when you scratch off the outer bark of a branch, covering it with moist peat moss or something similar and then wrapping it up until it grows roots from the exposed inner bark. Root tone is often used. I used some branches that were close to the ground and then covered it with a layer of dirt. Finally after about six month I have enough root growth to cut off from the main plant and put into the ground. Fairly similar to cloning, but doing it while still connected to the plant.
Now I have two more Crispa/Pie Crust Bay leaf plants. At $15/4" plant, this a great way to multiply established plants cheaply.