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Onions belong to the genus Allium along with garlic, chives, shallots, and leeks. The common onion (Allium cepa) is widely grown in Iowa gardens. Onions are grown either as green onions or dry (storage) bulbs.
Haynes, Cynthia; Nair, Ajay; Jauron, Richard; and Everhart, Eldon, "Onions" (2018). Extension and Outreach Publications. 351.
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