Spectracide Weed & Grass Killer with the AccuShot continuous power sprayer is a nonselective weed and grass killer that kills all types of weeds and grasses down to the root. It's formulated for spot treatment of weeds and grasses on patios, walkways and driveways; around flowers, shrubs and trees; and along fences and foundations. This formula is rainproof in 15 minutes?rainfall or watering after 15 minutes won't wash away effectiveness. Spectracide Weed & Grass Killer2 kills down to the root and delivers visible results in as fast as 3 hours. Plant new flowers, trees and shrubs in the treated area after just 1 day. When used as directed, Spectracide Weed & Grass Killer works the first time, every time! For best results, apply this ready-to-use spray during warm, sunny weather when the temperature is over 60 degrees. Completely cover the leaves of the Brinkmann's Blue Point vegetation.