Allium fistulosum

Allium fistulosum is a perennial onion species cultivated for its hollow green leaves and mild white stems. It forms little or no large bulb and is commonly called Welsh onion or bunching onion.

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Allium: Allium is a genus of flowering plants that includes onions, garlic, leeks, and chives. This species belongs to the genus, whose shared traits include distinctive onion-family aromas.
Scallion: A scallion is an onion harvested for its green leaves and slender, undeveloped bulb. Welsh onion is commonly sold and used as a scallion, though the name also covers young onions.
Allium schoenoprasum: Allium schoenoprasum is the perennial species commonly known as chives, with narrow leaves and small flowers. Chives are a finer-leaved perennial allium often confused with Welsh onion.
Evergreen Hardy White: Evergreen Hardy White is a cultivar of Welsh onion grown for slender, hardy green onions. It exemplifies cultivars selected for dependable overwintering and repeated harvest.
Vegetative reproduction: Vegetative reproduction is the production of new plants from non-reproductive plant parts. Welsh onion can multiply by division, allowing clumps to persist and spread.
Amaryllidaceae: Amaryllidaceae is a family of flowering plants that includes Allium and many bulb-forming species. The family places Welsh onion among its closest botanical relatives.
Japanese cuisine: Japanese cuisine is the culinary tradition of Japan and its regional foodways. Welsh onion is widely used in Japan, often as negi in soups, noodles, and hot pots.
Allium tuberosum: Allium tuberosum is the species commonly called garlic chives, with flat leaves and a garlic-like flavor. Its flat, garlic-scented leaves contrast with Welsh onion's hollow leaves and milder onion taste.
Ishikura: Ishikura is a Japanese cultivar of Welsh onion bred for long, thick white stems. Its prominent white stems show how cultivation can emphasize stem length over bulb formation.
Tillering: Tillering is the production of side shoots from the base of a grass or grass-like plant. Basal shoots create the clustered growth that supports the bunching-onion form.