Biennial or annual thistle < 2.5 m tall. Stems are erect and winged. Leaves are narrow, deeply divided and form flat rosette. Stems and leaves are spiny and sometimes woolly. Inflorescences are purple and borne at the end of the stems. Achenes bear pappus.
To help protect our environment:
Roadsides, fields, wasteland, disturbed sites, pasture.
Seeds dispersed by wind.
Aggressively infests pastures, reducing forage quality and accessibility to stock. Spines can cause injuries to humans and livestock.
Maintaining good pasture cover can prevent establishment or suppress an infestation. Prevent overgrazing especially in summer. Other herbicides are available for selective use in pasture.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.