Preen® Garden Weed Preventer - 17.5 LB DrumPreen Garden Weed Preventer helps keep your landscape beds clean and weed free by preventing new weeds from germinating before they start. Designed for use in flower beds, vegetable gardens, around trees and shrubs, and in ground covers, this easy to apply granular formula stops weeds for up to three months, guaranteed. Unlike weed killers that treat weeds after they appear, Preen works before weeds begin, stopping weed seeds from germinating in the