Negi, the Japanese name for Allium fistulosum (Welsh onion)

The name "Welsh onion" has become a misnomer in modern English, as Allium fistulosum is not indigenous to Wales.

The oldest specimen is either Allium fistulosum or Rosa parvifolia, both collected about the time Joseph Spence was designing gardens.

Species inoculated with virus that do not show signs of susceptibility: Allium cepa, Allium fistulosum, Amaranthus retroflexus, Apium graveolens, Beta vulgaris, Brassica campestris ssp.

The Welsh onion (Allium fistulosum) does not form bulbs even when mature, and is grown in the West almost exclusively as a scallion or salad onion, although in Asia this species is of primary importance and used both fresh and in cooking.