Bayer Advanced All-In-One Lawn Weed & Crabgrass Killer kills over 200 of the most common broadleaf weeds like dandelions and clovers and also controls grassy weeds like crabgrass. Won't harm lawns when applied as directed. Rainproof in one hour. Allows for hose-end sprayer application. Can also be used in tank sprayers. Treats up to 6250 sq ft.