So it's spring and it's time to start working on our lawns. My lawn is new and it's a mess. It was neglected for years before I got there. I have bare patchy spots, i'm sure there is a percentage of crab grass and most of the soil is hard packed. I've had the soil tested and ph is right around 7.3. I know it needs to be aerated and fertilized. But at what point do you know if you need to start from scratch?