Grafting and Budding

By Patrick Samson

Another method of increasing certain shrubs and their garden varieties is grafting and budding, where part of the plant to be propagated, either a graft or a bud, is transferred and attached to well-rooted stock of a common species. For some shrubs and fruits this is practically the only and most reliable means of propagation (tea roses, lilac, magnolia, apples and pears).

Shrubs bearing terminal panicles or racemes on strong summer shoots require harder pruning at the beginning of spring, otherwise they produce weak shoots and scanty blossoms. In such instances the shoots should be shortened to as much as half their length. This group includes mostly shrubs that do not flower until June, e.g. Cytisus, Spiraea salicifolia, Spiraea japonica, Buddleia, Colutea, Ligustrum, Rosa rugosa and remonant roses, Lycium, Hibiscus.

A T-shaped incision is made in the bark of the stock and the bud is then slipped between the bark and bud usually remains dormant throughout the autumn and winter and does not start growing until the following spring. However, a percentage of early budded roses begin growing as soon as the bud is united.

The best time for grafting in the open is early spring (March to April), when the stocks begin to bud. In the greenhouse, where the scions are grafted onto potted and budding stocks, the, best time is January and February. The branches for grafting are preferably cut about one month or more before grafting and heeled in agains(a shady wall or in the refrigerator. The actual scions are prepared from these branches just before grafting.

It is just as important to conceal disruptive and unattractive elements such as a wire fence, wall or shed, and is superbly aided by shrubs which can be used to form a green partition, either as a trimmed hedge or freely growing border of green. Best suited for hedges are densely-branched shrubs which stand up well to pruning. Impenetrable thorny species can be used in places Where exceptionally good shelter is desired.

Slit or notch grafting is used when the diameter of the stock is several times greater than that of the graft. With this method a wedge-shaped incision is made in the stock and the scion, cut at an angle corresponding with that of the wedge-shaped incision, is fitted into the stock. It is also possible to merely make a straight cut in the stock and spread the tips apart to receive the scion. - 20607

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