Weed ban is the first natural weed control on the market. It's made from a product of corn syrup production and works by stopping the development of the secondary feeder roots, causing the seedling to die. This is a reemergent product, effective against dandelions, crabgrass, creeping bent grass, foxtail, lambsquarter, purslane, redroot pigweed, smart weed, barnyard grass and bermuda grass. Weedban converts to approximately 10% Nitrogen. It is a weed and fed product, not just a herbicide.