Powered by the Centre for Invasive Species Solutions
Plant Form: Erect biennial herb.
Size: Up to 2 m tall.
Stem: Erect, with wings up to 1.5 cm wide, and spines to 5 mm long. Woolly or cobwebby appearance.
Leaves: Grey-green, spiny, egg to lance-shaped, up to 35 cm long.
Flowers: White to purple heads up to 6 cm diameter.
Fruit and Seeds: Brown-grey 4-5 mm long, ribbed with hairs on top.
Habitat: Pastures, irrigated and dryland cropping areas.
Distinguishing Features: Similar to other Onopordum species, but with a stem unlike Stemless thistle (Onopordum acaulon), and with deeper lobed leaves and more woolly stems than Illyrian thistle (Onopordium illyricum).