This method stimulates root formation in plants that are difficult to grow from cuttings and that have stiff, upright stems that cannot be layered by being brought down to soil level. If a houseplant such as a rubber plant, codiaeum or dracaeana becomes unattractive as a result of losing its lower leaves, air layering can help to rejuvenate it. The aim of this procedure, as the name suggests, is to stimulate rooting at some point on the stem without lowering the stem to the surface of the potting mixture.