This is a DOW Chemical product, see your local farm supply store. Works great on the dandelions and even thistle in my lawn.
Curtail® M Herbicide
Curtail® M herbicide translocates to the roots of stubborn perennial weeds, providing outstanding control of Canada thistle. In addition, Curtail M also controls many annual broadleaf species, such as wild mustard, wild buckwheat, pigweed, lambsquarters, volunteer sunflower and more. Curtail M contains clopyralid and MCPA, and it is helpful for small grains growers who want the superior crop tolerance offered by MCPA in their weed control programs, but still require powerful broadleaf weed control.
