Spectracide Weed Stop For Lawns controls more than 460 types of weeds as listed, and it won't harm the lawn when used as directed. Use it to treat your lawn, including bluegrass, fescue, Bermuda, perennial ryegrass and zoysia (do not apply to zoysia just emerging from dormancy). This formula kills by contact down to the root, with visible results in as little as 3 hours. It controls all types of listed broadleaf weeds, including dandelion, chickweed, clover and yellow nutsedge (see the product label for a complete list). Apply when temperatures are between 45 and 90 degrees Fahrenheit. Spray until wet to control weeds. Do not apply when daytime temperatures are above 90 degrees because lawn injury can occur. Read the entire label before using.