Layering is the process by which a part of a plant stem is made to produce roots while still attached to and nourished by the parent plant, so that it may be able to maintain an independent growth. The tendency, under favorable conditions, to produce roots from the cambium zone of some part of the stem is manifested by many plants, especially in the tropics. With most such plants, rooting by detached parts is easily accomplished, and this being more convenient, layering is generally practiced only with those plants which do not root readily from cuttings.