Ortho Weed B Gon plus Crabgrass Control Ready-To-Use2 is guaranteed to kill crabgrass, dandelions, and other listed common lawn weeds to the root! With the convenient trigger applicator, you can kill 200+ weeds without damaging your lawn for easy and effective spot treatment. And Ortho Weed B Gon starts working immediately see results in hours! When used as directed.