Preen, 13 pounds, garden weed preventer bag. covers 2,080 square feet stop weeds before they start for up to 3 months, guaranteed. safe for use around over 200 established flowers, vegetables, trees and shrubs. apply anytime in spring, summer or fall. use in flower, shrub and all bedding areas. not for use on lawns. weed preventer does not kill existing weeds. safe for use on edibles.