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Grapefruit (Citrus×aurantium? Linnaeus) is a woody plant of Citrus in Rutaceae. Branches have long thorns; The leaves are oval or oval; Calyx hairless, petals slightly smaller than pomelo flowers; The fruit is spherical or oblate, the peel is thick and difficult to peel, orange or vermilion, uneven, and the pulp tastes sour and sometimes bitter.

Fruit period 10- 1 1 month. The distance between the fruits of grapefruit is very close, usually clustered, because the fruit of grapefruit is not big and looks like a grape, so it is called grapefruit.

Grapefruit originated in Central America, and the main producing areas in the world are South Africa, Brazil, West Indies and the United States. It was introduced to China in the early 20th century, and it was only cultivated sporadically in Taiwan Province, Sichuan, Guangdong and Zhejiang, with Taiwan Province Province producing the most. Grapefruit has strong adaptability, heat resistance, high yield and long storage period, which is suitable for high temperature and dry climate. Grapefruit is propagated by grafting.

Grapefruit is rich in nutrition, which is inferior to other citrus fruits. The fruit is slightly fragrant, sweet and sour, and has a unique flavor. It can be eaten fresh, canned or made into juice. Grapefruit is not only a good fruit tree species, but also a good garden ornamental tree species, especially in courtyard planting, which can not only harvest fruit, but also beautify the house.

Essential oil and naringin can be extracted from the peel of grapefruit, pectin can be extracted from the mesocarp and made into candied fruit, and seeds can also be pressed for oil. Grapefruit is also often used as a flavoring agent in frozen desserts, baked foods, carbonated drinks and alcohol; It is also the fragrance of cosmetics, detergents, soaps and soaps.

The origin of grapefruit is somewhat legendary. After Shaddock planted Jamaican sweet orange and Indonesian pomelo in Barbados, natural hybridization occurred between pomelo oranges, and grapefruit came into being in the world.

Generally speaking, the grapefruit at the beginning was considered unpalatable. It was not until A.L.Duncan, a Florida native, discovered a superior grapefruit plant and named it "Duncan" in 1892 that grapefruit began to be planted commercially. The mother tree of Duncan grapefruit is still alive, and the age of the tree is over 160 years. Red-fleshed grapefruit was mutated from common white-fleshed grapefruit in 1929.