Onion (scientific name: Allium cepa L.) is a perennial herb of the Liliaceae and Allium genus. Bulbs are thick and nearly globular; paper to thin leather, thick endothelium, fleshy, cylindrical leaves, hollow, thickest below the middle, gradually narrowing upwards, shorter than scapes, scapes stout, up to 1 meter tall, umbrellas Inflorescence globose, with many dense flowers; pollen white; perianth with green midvein, oblong-ovate, equal filaments, ovary nearly globular, and concave nectar with curtain at base of abdominal suture; 5-7 Months bloom and bear fruit.
It is native to western Asia and is widely cultivated both in China and abroad. It is one of the main vegetables in China. China's onion producing areas are mainly in Fujian, Shandong, Gansu, Inner Mongolia, Xinjiang and other places.
Onion contains prostaglandin A, which can reduce peripheral vascular resistance and blood viscosity. It can be used to lower blood pressure, refresh the brain, relieve stress, and prevent colds. In addition, onions can also remove oxygen free radicals in the body, enhance metabolism, resist aging, and prevent osteoporosis. It is a health food suitable for middle-aged and elderly people.
