I've limed, fertilized, seeded, watered, prayed to the Lawn God and you see the result. My neighbor tells me this area was a gravel pit at one time, many, many years ago. Whatever they used for fill is only good for growing weeds, but you can see those darn sweet gum balls, and how many we have to deal with. I think it's a reasonable tradeoff, the shade for the potential water heating system and no more sweet gum balls! Plus, without the tree blocking the sun, I'll get a better tan!