Onion, Herbaceous biennial plant (Allium cepa) of the family Alliaceae, probably native to southwestern Asia but now grown worldwide, and its edible bulb. Among the hardiest and oldest garden vegetable plants, onions bear a cluster of small, greenish white flowers on one or more leafless stalks.
Onions are high in vitamin C, which may help regulate your immune health, collagen production, and iron absorption. It's also a powerful antioxidant that could help protect your cells from unstable, damaging molecules called free radicals.
Indian onions are famous for their pungency and are available round the year. Indian onions has two crop cycles, first harvesting starts in November to January and the second harvesting from January to May. The onion is a hardy cool-season biennial but usually grown as annual crop.