I used GC about 5 years ago and it worked great! I used it this year and it only barely killed the grass an no other vegetation. I sprayed a second time and the results are the same. I will not go back to this product. I purchased Cornerstone Plus concentrate. It was very expensive and it did the job. Next I will experiment with salt, vinegar and soap to see how effective that is next year to save some $$$. Again Groundclear had minimum effect on the weeds here in Washington State.