I never use the stuff because I've never noticed it to be particularly effective. I prefer a pre emergent. It's easier and more effective. I used Preen for southern gardens for about two years, and it worked pretty well. I've just recently started using snapshot on mulch, and it appears to be a great product. I always price mulch jobs with pre emergent(when appropriate.). It's an easy thing to do and customers appreciate that they hardly ever see weeds in their beds.
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