. Plant propagation : greenhouse and nursery practice . Plant propagation. ilEXnODS 01' GRAFTING 249 322. Cutting-grafting, as its name implies, is a union of a graft with a cutting, a special case of which is root grafting already described (305). Plants hard to propa- gate by cuttings are often grafted upon cuttings of other varieties or related species which root readily. When the work is done outdoors in spring the grafts are usually ready to have the stocks removed by fall, the cuttings having rooted : and when done in fall under glass they are ready by spring. The nurse plant may be remo
. Plant propagation : greenhouse and nursery practice . Plant propagation. ilEXnODS 01' GRAFTING 249 322. Cutting-grafting, as its name implies, is a union of a graft with a cutting, a special case of which is root grafting already described (305). Plants hard to propa- gate by cuttings are often grafted upon cuttings of other varieties or related species which root readily. When the work is done outdoors in spring the grafts are usually ready to have the stocks removed by fall, the cuttings having rooted : and when done in fall under glass they are ready by spring. The nurse plant may be removed little by little or all at once, according to the case in hand. A modification of the method is to let the cion ex- tend downward into wet moss or a bottle of water (Fig. 199). This is used where stock and cion are more or less uncongenial or are slow to unite. Various birches, magnolias and mulberries are handled in this way. 323. Grafting tubes (like laboratory test tubes), about .3''2 inches long and one inch wide have Ijeen used with good re- sults for propagating shrubs and trees at the Swedish Agricultural College. Each graft-cutting is covered with a tube, the lower end of which is pressed into damp moss. Any convenient method of grafting is used (whip, splice, etc). Grafting wax was abandoned because as good results were secured without it. The plan gave good results in sand beds, flower pots and in open air. Among the subjects which did well out of doors were rose, maple, alder, birch, beech, fir, gooseberry, currant. 324. Herbaceous grafting, mainly by means of veneer, saddle and cleft methods, is ver}' easy. Any plant with semi-succulent stems, such as coleus, chrysanthemum, geranium and the shrub-like begonias, can be grafted. Both stocks and cions should ha\-e passed the watery stage and become as firm as for the making of cuttings. After adjusting the two parts the graft should be bound with raffia, placed in a propagating frame and kept in a. FIG. T99—BOTTL
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