Cornerstone Plus Weed and Grass Killer HerbicideCornerstone Plus Herbicide provides broad spectrum weed control. It is a post emergent, nonselective herbicide that is absorbed and translocated throughout annual and perennial grass and broadleaf weeds for "shoots to roots" control. Nonselective herbicide. Controls more than 100 annual and perennial weeds and includes a broad spectrum of uses. Tank mix compatible with some adjuvants and surfactants for better control. 30 minutes rain ready. Available