Allium fistulosum L., is a member of the onion family, Alliaceae. The names are ambiguous, as some may also be used to refer to any young green onion stalk, whether grown from Welsh onions, traditional bulbing onions, or other members of the onion family. The species is very similar in taste and odor to the related garden onion, Allium cepa, and hybrids between the two exist. The Welsh onion, however, does not develop bulbs, and possesses hollow leaves and scapes. Large varieties of the Welsh onion resemble the leek, such as the Japanese ‘negi’, whilst smaller varieties resemble chives. Many Welsh onions can multiply by forming perennial evergreen clumps.