What is the best way to eradicate thistle weeds?
New Castle County Delaware
Where is it growing will affect the control method selected. In a flower bed,continual hand pulling will weaken the rhizome to where it will eventually die.On a lawn, a combination herbicide of 2,4-D and MCPP will slow it down. Fall is the best time to apply the herbicide. If it is growing wild on a slope,prevent the seed heads from developing and treat it with an herbicide in the fall. More than one treatment is needed to eradicate the weed.http://extension.psu.edu/pests/weeds/weed-id/canada-thistle