This did a job on my crabgrass. Its been 1 1/2 since spraying and one mowing later it appears to have gotten most of the crabgrass. I may have to follow up in a few areas that had an extra heavy concentration. It did not do anything to the yellow sweet clover I had and only wrinkle the buck horn a little but did not kill as best as I can tell. Then again, maybe it wasn't supposed to.