It is recommended to apply when soil temperatures are at least 65°F and daily temperatures are over 80°F. I hit the mark barely. My soil temperatures are fluctuating between 64° and 65° and my daily temperatures in Alabama range from 74°-85°. Not bad, huh?
My primary weed target was burweed, poa annua, and several different clover and broadleaf weeds. The clover and broadleaf were clearly dead after 3 days, the poa in about 5 days, and the burweed was starting to yellow after 7 days.