As you can see by the huge green tufts of grass, the second hydro-seeding took better in places than others even though we watered like crazy people after they did it. This is the back yard (we also have the side and front) which is in the worst shape. But still.
I'm sure you can see the balding spots which ironically, sit above the septic tank. I honestly think the grass is having a hard time because no top soil was put down before they hydro-seeded. They just went over what was still there. Every now and then, I go out to re-fill the bird feeder and end up pulling up sticks, twigs, etc that are in the grass. Not from falling debris, but stuff that is actually IN the grass.
You would think, that when you build a new house, you would FINISH the yard that goes with it....... but then again? maybe not.