Final-San-O is a fast-acting weed, grass, algae and moss killer. Inadvertent overspray will not stain concrete, pavement, stucco or wood. Final-San-O is a non-selective herbicide that controls many common annual weeds. Final-San-O suppresses the growth of some bi-annual and perennial weeds. It can be used in cultivated areas prior to planting grass, flowers and vegetables. Areas can be re-sown five days after treatment. Final-San-O can be used at any time during the year. Best results are obtained with young, actively growing weeds, less than five inches in size.