Dual Action Formula Kills Existing Weeds To The Root & Prevents New Weeds From Growing For Up To 4 Months, Kills Existing Weeds Down To The Root, Prevents New Weeds From Growing For Up To 4 Months, Starts Working Immediately With Visible Results In 24 Hours, Rainproof In 30 Minutes, Control That Won’t Wash Away, Use To Kill Existing Weeds & To Pre-Treat Weed Prone Areas Such As Driveway & Sidewalk Cracks, Patios & Paths, Tree Rings & Mulched Areas, & Along Fence Lines, Contains: 18% Glyphosate, 0.73% Diquat, 0.3% Imazapic.