The growing of vines from single buds is mainly practised with new varieties where rapid propagation is desired with a limited stock of new wood. It is also practised with such varieties as Delaware, that do not readily root from dormant cuttings planted in the open air. The buds are cut from thoroughly ripened wood late in autumn and kept in moist cellar, where they will not get dry. In February or March at the North the wood is divided into cuttings, as shown in Fig. 64. The cuttings are stuck in shallow boxes filled
Fig. 64. - Single-eye cuttings. A, usual plan of cutting; B, some grooves shaved off the lower side.
with pure sand, inserting at an angle so the bud will be upward and not more than half an inch below the sand. The filled boxes are placed in a propagating house with gentle bottom heat.
The best temperature of the air is about fifty degrees and that of the sand about forty degrees. When the leaves begin to expand the heat can be increased, both of air and sand. The sand is kept uniformly moist, but not wet. When the cuttings have made a growth of two or three inches they are potted in two- or three-inch pots. The pots are placed where the air is confined and quite moist for a few days, when they can be gradually exposed to the outer air when spring is sufficiently advanced. With some care in ventilation the boxes of cuttings can be placed in a hot-bed for rooting. Grape-cuttings are often made from unripe wood. These root more rapidly from single-eye cuttings than those from ripe wood, but they rarely make healthy, strong plants. Some really valuable new grapes have made a bad reputation by being propagated at first from green wood cuttings.