The Preen Garden Weed Preventer is a granule form weed control product designed for outdoor use in gardens. It blocks weeds up to 3 months and is effective against various types of weeds including crabgrass, chickweed, and woody weeds. With an EPA registration number of 961-407, this ready-to-use product covers an area of 3520 sq. ft and weighs 22 lbs, making it a convenient and effective solution for maintaining a weed-free garden.