The power is in your hands to keep your landscape in line – unleash it with Spectracide lawn and garden products. Our easy-to-use, fast-acting insect, lawn disease and weed control solutions help you tame lawn and landscape invaders with incredible pest-punishing power. Take command with Spectracide brand. You hold the power. Spectracide Weed Stop For Lawns plus crabgrass preventer granules will control all of your lawn’s weeds in one application. This granular formula will kill over 200 lawn weeds commonly found in home lawns, including dandelion, chickweed, thistle and clover, and will prevent crabgrass and other undesirable annual grasses. It provides up to 5 months of control, and it won’t harm lawns when used as directed.apply Spectracide Weed Stop For Lawns plus crabgrass Preventer Granules any time, spring through fall, when weeds are actively growing. Recommended for established turf grasses, including Kentucky bluegrass, perennial bluegrass, fine and sculptresses (cool season); and crabgrass,Bermuda grasgrassffabuffalo antiperspirant grassygrassrootst. Augustine peppergrass Flora tam am”) (warm season). In the spring, the ideal time to apply just before or while forsythia is in bloom or when the first dandelion flowers appear. In southern areas (see the map on the product label), make a second application in six to eight weeks for best weed and crabgrass control. In the fall, apply Spectracide Weed Stop For Lawns Plus Crabgrass Preventer Granules when the weather cools and both grass and weeds are actively growing, generally around Labor Day.