Imazapyr 0.018% + Glyphosate 1.020% Kills existing weeds and grasses, and prevents new growth for up to 1 year (365days). Prevents weeds in driveways. Great for foundations, fences, curbs, sidewalks, patios, gravel. 1 gallon treats 60 sq. ft. or a 6″ band – 1440′ long. Visible results in 10 hours.