I mixed it with the poison ivy/brush killer and used it at the base of my fence that butts up next to a field and it worked out great. I even sprayed in the field a few feet to keep it off the fence and it wiped them out. There was alot of over grown weeds that where already mature too. It did take a bit over a week to see the result but it did the trick. I also sprayed the crack in my driveway I have yet to see a weed.