How to Propagate Perennial Crops by Layering
“Of all the plant propagation methods you might use in your garden, the most natural ones make use of layering techniques, so named because you create a new ‘layer’ of plants from the old one. The most common procedures, called stem layering or tip layering, involve bending over low stems and helping them to root into nearby soil. The mother plant is left undisturbed, and the new plant is not severed until a sound root system has established.
With time and patience you will get a bigger, huskier plant than you would get by rooting cuttings, and if you keep it up, you will always have vigorous young plants coming along.”