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Onion (Allium cepa, Liliaceae) is the bulb forming species which can be grown directly from seed or, most commonly, from sets. Onion products include fresh, frozen, canned, pickled, and dehydrated forms. Shallots (var. aggregatum), spring onions and green onions are onions harvested while immature. We provide information about the numerous aspects of production of onion including cultivation, pests and diseases, harvest, postharvest and storage.