Tenacity herbicide is an excellent broadleaf and grassy weed killer for cool-season turf. It can be used for pre- and post-emergence control of more than 46 broadleaf weed and grass species. Tenacity controls difficult weeds like Crabgrass, Goosegrass and more. Visible results in 10 - 14 days Great for cool season grasses such as Fescue, Rye and Kentucky Bluegrass, without fear of damaging turf Controls more than 46 varieties of weeds One bottle covers 43,000 - 87,000 square feet