Because of its rooting system, Nutsedge, or nutgrass, is particularly difficult to control. Pulling it simply encourages more growth, and it takes a selective (or targeted) weed killer to control it. In the fight against nutsedge, you need ferti-lome Weed-Out Nutsedge Control. Weed-Out Nutsedge Control kills both yellow and purple nutsedge, and over 50 other broadleaf weeds in warm and cool season lawns and select ornamental plants. 16 oz. concentrate bottle.  

When should it be used?  Works best when applied during the growing season on young weeds - but also works on established weeds if sprayed thoroughly.
Where should it be used? Use on well established turf grasses and select ornamentals. Cool Season Grasses: Creeping Bentgrass, Fine & Tall Fescue, Perennial Ryegrass, Kentucky & Rough Bluegrass. Warm Season Grasses: Bahiagrass, Bermudagrass, Buffalograss, Carpetgrass, Centipedegrass, Kikuyugrass, Seashore Paspalum, St. Augustinegrass, Zoysiagrass. Select ornamentals, including Boxwood, Roses, Yews, Butterfly Bush, Rhododendrons, Spirea, and Crepe Myrtle. 
What weeds are prevented? Purple and Yellow Nutsedge, Kyllinga, Plaintain, Clover, Spurge, Woodsorrel, Knotweed, Chickweed, Curly Dock, Wild Onion, Wild Garlic, and other listed weeds.
How is it applied? Spot spray weed directly until runoff. Some weeds may require repeat application.
What is the active ingredient? Sulfentrazone 1.4%.
Is it safe for pets? Must be allowed to dry. Do not spay near ponds. 

Always read and follow label directions.