Preen Garden Weed Preventer allows users to apply Preen to prevent weed seeds from germinating. Shake on bedding areas and water in to prevent weeds for up to 3 months. Use in flower, shrub and all bedding areas. All existing weeds and grasses must be removed prior to use. Preen Garden Weed Preventer 13-lbs. 2080-sq ft Pre-emergent Herbicide | 2463801