I live in Southeast PA on a 1 acre lot full sun, new construction. The lawn was seeded in July, died. The last week of Sept, I harleyraked and reseeded(blue/rye/red fescue). I had a soil analysis and adjusted the pH and fertility needs. I have about 70% germination, but it is thin and soil still shows. I am trying to figure out what to do in spring: 1. split treatment of dimension in March and May and broadleaf treatment in May; reason being last year, many neighbors of mine had major crabgrass/weed problems, I think due to late seeding(may and june)/heat/drought/poor fertilizing/improper irrigation. or 2. aerate and overseed in April to get a thicker turf and then hit with braodleaf weed control after a few mowings in late may or june. I will maintain the turf at about 3.5-4".