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Tree Onion (Allium Cepa)
A bush-like plant (growing up to 150cm/5 feet in height) that produces underground bulbs, similar to small onions. Once the greenish-white flowers die back, bulbs are produced in the air, where they have been. They are often pickled.
Tree onions are also known as 'Egyptian onions' or 'Lazy Man's Onions'.