Many of the worst ones are actually living in lawns in the neighborhood. Or your own. If you use a treatment on the lawn that is also beneficial to the lawn, you can kill a lot. I would lose whole plants, usually like Urkle or Space Queen or GDP. I took care of a kids rabbits. He was a day late and one wiggled into a closet. Guess what he only ate? The two best-GDP and GSC. I told the kid later and he guessed which one of three it was, ate like 18" plants...He said, "Oh, I bet it was the white one...he was being really nice last night to my brother and sister..." He also assumed I was mad, but it was too funny. They were killer clones too of course, but i got a lot left anyway.