Pulverize Weed & Grass Killer is a fast acting, weed, grass, algae and moss killer. Incidental over spray will not stain concrete or pavement. Pulverize Weed & Grass Killer is a non-selective herbicide that controls many common annual weeds. Pulverize Weed & Grass Killer suppresses the growth of some bi-annuals and perennial weeds. It can be used in cultivated areas prior to planting grass or flowers. Best results are obtained with young, actively growing weeds, less than five inches in size.