Compare 'N' Save Grass and Weed KillerGet to the root and kill grass and weeds with Compare N Save 41 percent Glyphosate Concentrate Grass and Weed Killer. Use for lawn or garden replacement, on patios, walkways, or in and around fences and gardens to remove unwanted grass and weeds. Visible results in as little as 2 to 4 days. Kills all grass and weeds. Rainproof in 2 hours Contains 41 percent glyphosate For Best Results: For best results, apply on a warm sunny day when daytime