It’s Not Too Late - Crabgrass Control
You can still get effective pre emergent crabgrass control well into May by applying Turf-Pro Green Up plus Dimension. The active ingredient, Dimension (Dithiopyr), will control crabgrass up to the three leaf stage. (Crabgrass is just starting to pop in Central NJ).
If you have seeded this spring, 35 days after seeding AND after three mowings, apply Turf-Pro Green Up with Dimension and still control crabgrass effectively.