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"The onion (also called bulb onion or common onion) and the shallot (A. cepa var. aggregatum), is a monocot bulbous perennial (often biannual). It is the most widely cultivated species of the genus Allium, which includes other important species such as garlic (A. sativum) and leeks (A. ampeloprasum). The name "wild onion" is applied to various Alliums."
Common Farm, garden
That's what happens when you leave onion out too long or when you treat it like a plant instead of a vegetable.