As a meals item, they are normally served cooked, as a vegetable or phase of a organized savoury dish, however can additionally be eaten uncooked or used to make pickles or chutneys. Onions are cultivated and used round the world. cepa, such as shallots and potato onions, produce a couple of bulbs. The crop is susceptible to assault through a variety of pests and diseases, mainly the onion fly, the onion eelworm, and a range of fungi which can purpose rotting.

The crop is harvested and dried and the onions are prepared for use or storage. In the autumn (or in spring, in the case of overwintering onions), the foliage dies down and the outer layers of the bulb emerge as dry and brittle. The bulbs are composed of shortened, compressed, underground stems surrounded via fleshy modified scale (leaves) that envelop a central bud at the tip of the stem. The onion plant has a fan of hollow, bluish-green leaves and its bulb at the base of the plant starts to swell when a sure day-length is reached. The onion is most regularly a biennial or a perennial plant, however is typically handled as an annual and harvested in its first developing season. Its ancestral wild unique structure is no longer known, though escapes from cultivation have turn out to be mounted in some regions. cepa is completely recognised from cultivation. The identify 'wild onion' is utilized to a range of Allium species, however A. ×proliferum), and the Canada onion (Allium canadense). This genus additionally includes countless different species variously referred to as onions and cultivated for food, such as the Japanese bunching onion (Allium fistulosum), the tree onion (A.

Its shut family consist of the garlic, scallion, shallot, leek, chive, and Chinese onion. The onion (Allium cepa L., from Latin cepa 'onion'), additionally recognized as the bulb onion or frequent onion, is a vegetable that is the most broadly cultivated species of the genus Allium.

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