There are three general divisions or kinds of graftage, between which, however, there are no decisive lines of separation: 1. Bud-grafting, or budding, in which a single bud is inserted under the bark on the surface of the wood of the stock. 2. Cion-grafting, or grafting proper, in which a detached twig, bearing one or more buds, is inserted into or on the stock. 3. Inarching, or grafting by approach, in which the cion remains attached to the parent plant until union takes place.
Budding is the operation of applying a single bud, bearing little or no wood, to the surface of the living wood of the stock. The bud is applied directly to the cambium layer of the stock. It is commonly inserted under the bark of the stock, but in flute-budding a piece of bark is entirely removed, and the bud is used to cover the wound. There is every gradation between budding and grafting proper.
Grafting is the operation of inserting a cion (or scion) — or a twig comprising one or more buds — into the stock, usually into an incision in the wood. It is variously divided or classified, but chiefly with reference to the position on the plant, and to the method in which the cion and stock are joined. In reference to position, there are four general classes: 1. Root-grafting, 2. Crown-grafting, 3. Stem-grafting, and 4. Top-grafting.
Veneer grafting makes no incision into old wood, and all wounded surfaces are completely covered by the matching of the cion and stock. It is not necessary, therefore, to wax over the wounds, as a rule. If used in the open, however, wax should be used. So far as the union of the parts is concerned, this is probably the most perfect form of grafting.