Tackle tough weeds in your lawn with Ortho Weed B Gon Chickweed, Clover & Oxalis Killer for Lawns Concentrate. This weed control product also kills ground ivy (creeping Charlie), speedwell (Veronica), wild violet, spotted spurge, thistle and more as listed. In addition, this product kills weeds to the root and is rainproof in 6 hours. When used as directed, this lawn weed killer won't harm listed grasses including Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass and Zoysiagrass. This product is a concentrate and must be mixed with water before application. To use, mix per label directions and apply using a tank sprayer or Ortho Dial N Spray hose-end sprayer, spraying until lawn surface is wet. If the lawn needs watering, water thoroughly before application, and avoid mowing for 1 to 2 days after application. Do not apply if the air temperature is above 90F. Do not allow people or pets to enter treated areas until spray has dried. This 16 fl. oz. container of Ortho Weed B Gon Chickweed, Clover & Oxalis Killer for Lawns Concentrate treats up to 3,200 sq. ft.