A giant spiny thistle that forms colonies on open ground. Declared in South Australia.
Forms dense spiny colonies on open ground, crowding out pasture and native ground cover, and building a long-lived seed bank.
Dig or chip out the taproot of rosettes before they flower. Spot spray large infestations in the rosette stage. Cut and bag any seed heads. Declared, so control is required.
Recorded on open ground in both September surveys.
Declared weed, present on Mount Skye.