Overseeding in the spring, summer and fall, depending on the type of grass you're sowing, is okay in most parts of the country, he says. Kentucky bluegrass thrives in full sun, but fescues and rye are more shade-tolerant, though they will grow in full sun, provided they get plenty of water. In the North, over-seed from late summer to early fall, about six weeks before the first frost. In the South late spring to early summer is the best time. Before buying grasses, ask a professional at a garden center or nursery what grasses are well-suited for shade in your area.
Rye grasses are available in both annual and perennial varieties.
The annual varieties work best as green-manure crops in the veggie garden. The perennial varieties are more commonly used as turf grass. Perennial ryes can tolerate more sun than fescues. Use a metal rake to remove any debris or thatch. Spread topsoil or compost on the lawn.