ferti-lome Weed Free Zone is our quickest working broadleaf weed killer. It's a professional formulation, so it's strong enough to kill mature weeds in your lawn. Weed Free Zone controls over 80 of the toughest-to-control broadleaf weeds including clover, bindweed, spurge, chickweed, dandelion, henbit, oxalis, poison ivy, purslane, shepherd's purse, thistle, black medic, Virginia buttonweed, wild onion and many others. Use it in fescue, Kentucky bluegrass, ryegrass, Bermudagrass, zoysia, and buffalograss - without harming the grass. Concentrated 1 pint (16 oz.) bottle.