With all of the construction over the past 2 years, we had zero grass in our backyard. 100s of nails and 1000s of concrete bits, brick bits and other construction debris, but no grass. I was able to get some to root last summer/fall. But to give you an idea how much, here is a photo from this past March: Only a few tufts of grass survived the winter.
Ahhh, and now a photo from this morning: ITS GREEN! OK, it's not fairway quality, but this was no easy task, given our 2 dogs and the fact we often invite friends with dogs to visit. I love Spring and having a green yard makes me happy.