Preen Garden Weed Preventer, 13 lb Bag: * Without weeds, your plants can grow larger and stronger * Does not kill existing weeds * Sprinkle Preen on dry soil and activate by watering * Forms a barrier in the top layer to protect against weeds * Apply Preen as early as possible * Can be applied at any time throughout the growing season * Rain proof * Covers up to 2,080 sq ft * Prevents over 200 weed types * Prevents weeds for up to 3 months