Roundup Weed Barrier Granules are formulated to create a weed barrier and prevent weeds from germinating around your desired plants. Safe to use around established trees and shrubs, annuals, flowers, and bulbs. With easy-to-apply formula, simply sprinkle the granules directly onto the soil around the desired plants and activate it by watering lightly. Recommended to apply before mulching once every 12 months. Effectively protect your plants against weeds such as bluegrass, crabgrass, foxtail, sandbur, carpetweed, chickweed, pigweed, and many more listed grassy and broadleaf weeds. See label for a complete list of weeds. Available in a 5.4-pound shaker bag.