Synonym(s): Asphodelus tenuifolius
Duration and Habit: Perennial Herb
Dark green in color and grows 12 to 30 inches tall and 15 inches wide. Numerous smooth, nearly cylindrical hollow leaves. Similar in appearance to onion leaves but lacks the onion scent and taste. The leaves are much shorter than the flowering stem and emerge from the base. Produces one to several stiff upright flower stem(s) up to 2 1/2 feet tall and branched. About three-fourths of an inch across with six petal parts, each white to pink with a brown or reddish stripe along the center. Flowers alternate along the branches. Fruit spherical in shape; divided into three segments. Seeds are brown or black triangular, one-eighth inch long, wrinkled, pitted and three or six per fruit. Thickened root crowns with many fibrous roots and no developed bulb.
Ecological Threat: In pastures and rangeland, onionweed develops populations that exclude grasses and desirable forage species. This federally regulated weed poses a serious environmental and agricultural threat.
Biology & Spread: It seeds prolifically and can establish large populations quickly.
History: Introduced as an ornamental.
U.S. Habitat: Onionweed is found in roadsides, pastures, waste places, disturbed areas, grasslands, and suburban settings. It is drought resistant and prefers sandy or gravelly soils.
U.S. Nativity: Introduced
Native Origin: Mediterranean region and from western Asia to northern India
U.S. Present: CA, NM, TX.
If you believe you have found onionweed, please report this species.
Distribution: Found occasionally in Texas, but no reported infestations.
Onionweed might be confused with some native onions (Allium spp.)
Can be managed through culitivation. Does not infest regularly worked fields.USE PESTICIDES WISELY: ALWAYS READ THE ENTIRE PESTICIDE LABEL CAREFULLY, FOLLOW ALL MIXING AND APPLICATION INSTRUCTIONS AND WEAR ALL RECOMMENDED PERSONAL PROTECTIVE GEAR AND CLOTHING. CONTACT YOUR STATE DEPARTMENT OF AGRICULTURE FOR ANY ADDITIONAL PESTICIDE USE REQUIREMENTS, RESTRICTIONS OR RECOMMENDATIONS. MENTION OF PESTICIDE PRODUCTS ON THIS WEB SITE DOES NOT CONSTITUTE ENDORSEMENT OF ANY MATERIAL.
United States Department of Agriculture. Animal and Plant Health Inspection Service. Program Aid No. 2010, Issued April 2009.
Arizona Sonora Desert Museum. Onionweed (Asphodelus fistulosus).
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Invasive Plant Atlas of the United States: Asphodelus fistulosus
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