Howdy, Completely renovated my lawn (zone 8 in SC) in September. Killed all grass & weeds, tilled soil, brought in 3 inches of top soil. My grass (fescue) has come up and in many areas is thick, green and healthy. I did experience a few downpours during germination and thus have a number of areas that are thin or altogether bare. Can I overseed in the Spring to get 100% coverage or is Fall such a better time to seed that I should wait a whole year to overseed? Finally, with a new lawn with no thatch layer and healthy plants, what is the best non-destructive method of overseeding? (by non destructive I am referring to the fact that core aerators cut out chunks of good grass, and wouldn't slit seeders cut up new grass too?) If I overseed in the Spring, I don't expect to have any dead grass to dethatch...just need to put down more seed to get the lawn thicker. Thanks!