Little wind dispersal of seed, which is relatively short lived. Spread generally by water or contamination of produce and equipment. Competes with crops and pastures and spines in heads injure grazing animals in eyes and mouth. Control by grubbing, cultivation, slashing or herbicide.
Links:
Department Primary Industries – NSW WeedWise – Star Thistle
Macquarie Valley & Lachlan Valley Weeds Authority Committees