Monterey Weed Impede 2-in-1 Ready-to-Use 32oz Monterey Weed Impede 2-in-1 Ready-to-Use 32oz For use in driveways, sidewalks, patios, gravel areas, rock gardens, around established trees and shrubs, etc One active ingredient controls existing weeds and the other goes into the soil to prevent weeds that have not yet emerged Full season weed control with one application