If the stocks are to be cultivated with a horse, the rows should be three or three and a half feet apart. Some growers sow in narrow drills and some in broad ones. The broad drills are usually six to ten inches wide. The earth is removed to the depth of two or three inches, if it is loose and in good condition, the seed is scattered thinly on the surface and the earth hoed back over them. If the ground is likely to bake, the seeds should not be sown so deep; and it is always well, in such cases, to apply some very light and clean mulch. The plants should be well cultivated during the season, and they should attain a height of six to twelve inches or more the first year. If the plants come thickly, they must be thinned out.
In the fall of the first year the seedlings should be large enough to be dug and sold to general nurserymen. Sometimes the poorest plants are allowed to stand another year, but they are usually so scattering that they do not pay for the use of the land, and they should be transplanted the same as the larger stock, or the weakest ones may be thrown away. The stocks are dug with a plow or tree-digger and heeled-in closely, so that the leaves “sweat” and fall off. The plants are then stored in sand, moss or sawdust in a cellar. Before they are shipped the tops are cut off near the crown, usually with a hatchet on a block. The stocks are then graded into budding and grafting sizes. The general nurserymen buy these stocks in fall or early winter. Those which are root-grafted are worked during late winter, but those intended for budding, or which must be grown another season before they attain sufficient size for working, are “dressed” (See [Chapter V]) and heeled-in; in the spring they are set in nursery rows, from a foot to eighteen inches apart in the row. The nurseryman reckons the age of his tree from the time the seedling is transplanted, rather than from the time the seed was sown.
Seedling raising is usually conducted by men who make it a business and who supply the general nurserymen of the country. It is largely practiced at the west, where the deep and strong soils produce a rapid growth. The yearling trees are graded by the western growers into about four lots: “Extras,” or those at least one-fourth inch in diameter at the crown and having twelve inches of both top and root; these are used mostly as budding stocks the next season, “Commons,” those between three-sixteenths and one-fourth inch at the crown and having eight inches of root; these are used for immediate root-grafting. “Second-class,” those from two to three-sixteenths inch at the crown, and “third-class,” or all those under two-sixteenths. The last two classes must be grown in the field for one or two seasons before they can be worked.
Dwarf stocks are mostly obtained from mound-layering. The common stock for dwarfing is the Paradise apple, a dwarf variety of the common apple species (Pyrus Malus). This variety rarely attains a height of more than four feet. A larger or freer stock is the Doucin, also a variety of Pyrus Malus, which will produce an engrafted tree intermediate in size between that given by the Paradise and free or common stocks. This is little used in this country. To obtain stools for mound-layering, the tree, when well established, is cut off within four or six inches of the ground in spring, and during the summer several shoots or sprouts will arise. The next year the stool is covered by a mound, and by autumn the layers are ready to take off. Sometimes, when stocks are rare, mound-layering is performed during the first summer, before the young shoots have hardened, but good stocks are not obtained by this method. Common green layering is sometimes practiced the first year, but it is not in favor. The dwarf stocks, in common with all apple stocks, may be propagated by root-cuttings and by hard-wood cuttings.
Apple stocks are either grafted or budded. Root-grafting is the most common, especially at the west where long scions are used in order to secure own-rooted trees. (See [Chapter V].) Budding is gaining in favor eastward and southward; it is performed during August and early September in the northern states, or it may be begun on strong stocks in July by using buds which have been kept on ice. Stocks should be strong enough to be budded the same year they are transplanted, but the operation is sometimes deferred until the second summer. Stocks which cannot be worked until the second year are unprofitable, especially on valuable land. For root-grafting, strong one-year-old roots are best, but two-year-olds are often used.
In common practice, the root is cut into two or three pieces of two to three inches each, but stronger trees are obtained, at least the first year or two, by using the whole root and grafting upon the crown. The lowest piece is usually small and weak and is generally discarded.
The apple is easily top-grafted and top-budded. (See [Chapter V].)
Apple Berry. See [Billardiera].
Apricot (Prunus Armeniaca). Rosaceæ.
The apricot thrives upon a variety of stocks. Apricot stocks are used in apricot-growing regions, especially for deep and rich well-drained soils. The pits grow readily if given the same treatment as that detailed for the peach (which see). The stocks are also handled in the same manner as peach-stocks. Apricots upon apricot roots are not largely grown outside of California, in this country. Apricot stocks can be grown from root-cuttings the same as cherries and other stone-fruits.