ALMOND

(Prunus dulcis), tree native to southwestern Asia and its edible seed, or nut. The nuts are of two types, sweet and bitter. Sweet almonds are the familiar edible type consumed as nuts and used in cooking or as a source of almond oil or almond meal. The almond tree, growing somewhat larger than the peach and living longer, is strikingly beautiful when in flower. The growing fruit resembles the peach until it approaches maturity; as it ripens, the leathery outer covering, or hull, splits open, curls outward, and discharges the nut. The sweet almond is cultivated extensively in certain favourable regions between 28 and 48 N and between 20 and 40 S. The tree greatly resembles the related peach, with which it occasionally hybridizes. While dormant, it is nearly as hardy as the peach, although ordinarily flowering earlier, from late January to early April north of the Equator. The nut crops are therefore uncertain wherever frosts are likely to occur during the period of flowering. Sweet almonds mature only occasionally in climates like that of southern England. The Old World almond cultivation was characterized by small plantings mainly for family use; trees interplanted with other crops; variability in age, condition, and bearing capacity of individual trees; and hand labour, often with crude implements. Modern growers pay more attention than they once did to propagation of approved varieties. Jordan and Valencia almonds come from Spain. Leading exporting countries of shelled almonds during the late 1970s were the U.S., Spain, Italy, Iran, Portugal, and Morocco. Bitter almonds, as inedible as peach kernels, contain about 50 percent of a fixed oil that also occurs in the sweet almond, together with an enzyme called emulsin, which in the presence of water yields glucose, prussic (hydrocyanic) acid, and the essential oil of bitter almonds called benzaldehyde. When the prussic acid has been removed, the oil of bitter almonds is used in the manufacture of flavouring extracts for foods and liqueurs. Almonds provide small amounts of protein, iron, calcium, phosphorus, and B vitamins and are high in fat. They may be eaten raw, blanched, or roasted and are commonly used in confectionery baking. In Europe a sweetened paste made from almonds is used in pastries and in marzipan, a traditional candy. The almond is also widely used in meat, poultry, fish, and vegetarian dishes of Asia.