Roundup Weed & Grass Killer Refill 1.25 Gal. Kills the toughest weeds and grasses to the root, Guaranteed. Convenient, no-mix formula. Use in and around vegetables gardens, flower beds, tree rings and mulched beds, as well as on cracks in driveways, walkways and patios. Rainproof in 10 minutes. Visible results in 3 hours. Active ingredients: 2% Glyphosate; 2% Pelargonic acid and related fatty acids.