Roundup Poison Ivy Plus Tough Brush Killer's exclusive formula combines two brush-killing ingredients. Specially formulated to penetrate the waxy leaves of hard-to-kill weeds and brush. Kills weeds to the root, guaranteed. Rainproof in 30 minutes. Visible results in 24 hours. Active ingredients Ready-to-Use: 1% Glyphosate; 0.1% Triclopyr. Active ingredients Concentrate: 18% Glyphosate, 2% Triclopyr.