Woolly Distaff Thistle Weed Killer
Carthamus lanatus Herbicide
Description of Thistle, Woolly Distaff (Carthamus lanatus):
Woolly distaff thistle, unlike most thistles, have yellow flowers instead of purple. It has become increasingly invasive in southern Oregon and northern California. They're so dense that they are crowding out grasses and native species to the areas.
Woolly Distaff Thistle Optimized Control Options Finder
According to the manufacturer approved labels: The following weed killer, applied at the listed application rates, will control Woolly Distaff Thistle.