Red grapefruit was actually introduced into the United States from China and Zhejiang hundreds of years ago. The root of blood pomelo is actually Hu pomelo (the name of China). Huyou is a hybrid of grapefruit and citrus, which tastes sour and bitter, because many varieties of grapefruit (except Shatian pomelo, which is rich in Guangxi) are slightly sour and bitter.

Supplement: red grapefruit, also known as grapefruit, Latin name: Citrus paradisi Macf. Small trees of Rutaceae and Citrus with drooping and hairless branches. The shape and texture of leaves are similar to those of pomelo leaves, but generally smaller, with narrow and short wings, and the midrib of young leaves is short and thin. Racemes, few or single flowers axillary; Calyx glabrous; Petals are slightly smaller than grapefruit flowers. The fruit is oblate to spherical, the peel is yellow and orange, and the constant ten strings produce spikes, which are shaped like grapes, hence the name. Smaller than pomelo, thinner peel, ringed or acyclic fruit top, petals 12- 15. The fruit is full and tender, with yellowish white or pink flesh, soft and juicy, refreshing, slightly fragrant and slightly sour, and some varieties have bitter taste and hemp tongue taste. Seeds few or none, many embryos. The fruiting period is 10- 1 1 month.