Last summer we had our yard torn up to get a new septic and 2 dry wells. We didn't do anything with it after they where done because we got a new roof as well. But the yard is a mess, there is crab grass, lambs wool and more weeds coming up. Should I put weed killer on it now live in NY, and then add the top soil, or will the top soil kill the weeds for me?? Not sure what to do any help would be great.. then I can plant vegs and flowers again.. Thanks sunflower3.