Grass growing question Zone 6, MA coast

[Major Nikon]

2. Here's a few tips

The first is to use pre-emergent in the late winter/early spring before the crab grass emerges. Post emergent control of crab grass is much more difficult. After seeding you really need to fertilize well and keep your grass cut to the height recommended for the variety of grass you have. Make sure your lawnmower blades are sharp. The healthier your grass is, the more likely it will choke out the weeds. Sometimes it takes a year or two of fertilizing vigorously to develop a lawn thick enough to do this.