Onion weed is native from southern Europe to India. Annual or biennial to about 70 cm tall. Leaves are onion-like, although it has no onion smell.
Onion weed produces abundant fertile seeds that can germinate most of the year, and this makes it difficult to control. Hardy weed, ignored by stock. Establishes in disturbed situations, favouring alkaline sandy soils. Now widespread and common from coast to arid inland. Weed of cereal crops and a major threat to arid rangelands.
See Using herbicides for more information.
Amitrole 250 g/L + Ammonium thiocyanate 220 g/L
Rate: 1.1 L per 100 L of water
Comments: Active growth before flowering. Repeat treatments will be required.
Withholding period: Nil
Herbicide group: Q, Bleachers: Inhibitors of carotenoid biosynthesis unknown target
Resistance risk: Moderate
Onion weed (Asphodelus fistulosus) is not declared in NSW under the Noxious Weeds Act 1993.