Apply Green-Up Crabgrass Preventer by Jonathan Green, in the early Spring. Feed the lawn and provide season-long crabgrass prevention. You can apply later than the National Brand because it kills crabgrass for a short time after it has emerged. Won't stain walkways and driveways, and feeds for 3 months!
Green-Up Crabgrass Preventer for 5,000 sq ft, available for in store pickup or delivery.
Have problems with weeds, try Jonathan Green's Green-Up Weed & Feed.