Pulverize Weed & Grass Killer is a fact acting weed, grass, algae and moss killer. Incidental over spray will not stain concrete of pavement. Pulverize Weed & Grass Killer suppresses the growth of some bi-annual and perennial weeds. It can be used in cultivated areas prior to planting grass or flowers. Areas can be re-sown five days after treatment. Pulverize Weed & Grass Killer can be used at any time during the year. Best results obtained with young, actively growing weeds, less than five inches in size.