The Welsh onion is not from Wales, and it is not even an onion.

Gardening · Published 3 October 2026 Swipe more like this →

In short: Despite its misleading name, the Welsh onion—Allium fistulosum—is native to China and lacks the bulbous base of a common onion. Instead, it grows as a perennial, hollow-leaved plant that forms evergreen clumps. This versatile vegetable is a staple across Asian cuisine, from Japanese negi to Korean daepa.

The name 'Welsh onion' is a linguistic relic rather than a geographical indicator. In older botanical terminology, the word 'Welsh' was used to denote 'foreign' or 'non-native' origins. Consequently, the plant has no historical connection to Wales, where the national vegetable is actually the leek, Allium ampeloprasum. While it is now naturalized across Eurasia and North America, its true roots lie in East Asia, where it has remained a culinary cornerstone for centuries, even after the introduction of the common onion, Allium cepa, in the 19th century.

Structurally, the plant is defined by its hollow leaves and scapes—the Latin name fistulosum literally translates to 'hollow.' Unlike the common onion, which develops a distinct bulb, this species grows in perennial clumps. It exhibits significant morphological diversity; larger varieties like the Japanese negi can resemble leeks, while smaller versions are comparable to chives. This adaptability has led to a variety of historical regional names, including the cibol, chibol, and the Scottish sybows or sybies.

Its culinary utility is vast, spanning continents and cultures. In East Asia, it is essential for dishes like miso soup, negimaki, and scallion pancakes. Korean cuisine distinguishes between varieties like the robust 'big scallion' (daepa) and the delicate 'thread scallion' (silpa), using them for everything from broth bases to garnishes for fried chicken. Beyond Asia, it appears in Jamaican cooking as 'escallion'—a key aromatic paired with thyme and Scotch bonnet peppers—and in various traditional South American dishes like empanadas and locro.

The ambiguity of common names often causes confusion, as terms like 'spring onion' or 'scallion' are frequently applied to any young green stalk from the Allium genus. However, Allium fistulosum remains distinct in its perennial nature and its specific role as a foundational spice and garnish. Whether used as a flavor base for infused oils or as a fresh, sliced topping, it remains a globally significant plant that thrives in diverse culinary traditions.

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