Ortho Weed B Gon Chickweed, Clover & Oxalis Killer Concentrate for Lawns, 16 oz. is a powerful weed killer designed to effectively eliminate tough weeds from your lawn when used as directed. This specially formulated concentrate targets persistent weeds such as ground ivy (creeping charlie), speedwell (veronica), wild violet, and other challenging lawn invaders. It becomes rainproof just 6 hours after application, ensuring reliable performance even in unpredictable weather. Suitable for use on Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass, and Zoysiagrass, this product works when applied during active weed growth and when temperatures are below 90 degrees Fahrenheit. Keep your lawn healthy and weed- with this solution from Ortho.