Fertilome Crabgrass Preventer Plus Lawn Food is Step 1 & 3 of our lawn care program contains Dimension ® which controls crabgrass and controls or supresses many other annual grass and broadleaf weeds in established lawns. Dimension is a pre-emergent weed controller which can be applied up to 4 weeks later than other pre-emergent crabgrass preventers (that's good since we never know exactly when the spring weather will become warmer here in Chattanooga). The Fertilome nitrogen and potassium rich 20-0-3 fertilizer helps to green-up the lawn for the spring/summer.