Preen Extended Control Weed Preventer 4.93 lb. Bottle, covers 805 sq. ft. One application blocks weeds up to 6 months guaranteed. It keeps 125 broadleaf & grassy weeds from sprouting. Use around more than 600 perennials, ground covers, shrubs & trees (as listed). Not intended for use on flower seeds, lawns, vegetable gardens, water gardens or other food-producing or edible plants.