Glyphosate is the active ingredient in the compare-n-save weed killer. It is not recommended for spot spraying in lawns. For best results, apply on a warm sunny day when the daytime temperature is above 60F and no rainfall is forecast for 24 hours. One gallon of ready-to-use equivalent will cover 300 square feet. Kills to the root to kill the plant. No residual activity. Treated areas can be replanted in as little as one day in ornamental areas. This powerful product kills almost all annual and perennial weeds, grasses, and other unwanted plants. Simply mix it with water and use to control unwanted growth around landscaping, walkways, or driveways - treats up to 63,000 square feet.