Yes, it works on alfalfa too. However I have only used smaller doses of glyphosate at about 1/2 qt per acre. I have not the nerve to hit my clover/alfalfa plots with 1 to 2 qts per acre. Grasses are more susseptable to gly than broadleaf weeds. Weeds can be controled by well timed mowings. It is a food plot, I don't mind a little grass. Just want to make sure the clover has the majority advantage.