Avocados may be propagated in a number of different ways. Nursery trees are produced by budding or grafting selected varieties on seedling rootoscks. Trees can be grawn from cuttings but the performance of such trees has not shown any advantage over budded trees and most vareities are difficult to root and establish. Older trees may be topworked to new varieties by various types of garfts or by budding into vigorous new shoots. This circular describes the more common procedures for avocado tree production in California, and methods that are used under especial conditions. Avocado trees grows from seed usually come into bearing slowly. Thee tree varies extremely in yield and fruit type; the fruit is rarely of acceptable quality. Even if the frut were good it w ould be difficult to market because each tree would bear fruit differing in size, color, shape, and quality. In cold locations where it is difficult to establish nursery trees, growers sometimes plant hardy seedlings direectly in the ochard. After the seedlings hove grown two or more seasons they can be grafted to the desired variety. Seedling trees are occasionally used as windbreaks.