The answer to 'frequency of seeding' is that the recommended frequency for seeding a lawn depends on the type of grass, the climate, and the condition of the existing lawn. In general, cool-season grasses like fescue or bluegrass should be seeded in the fall, while warm-season grasses like bermuda or zoysia are best seeded in late spring or early summer.
For an established lawn, overseeding is typically recommended every 2-3 years to fill in bare spots and thicken the turf. For new lawns or major renovations, seeding may need to be done annually for the first few years until the lawn is fully established. It's important to follow the specific recommendations for your grass type and local climate to ensure the best results.