posted 12 years ago
If you are seeding through the hay cover, you might want to spread the hay thin...like butter on toast. If not, the places where it is thicker will not allow the grass to grow and those spots will take a couple of seasons to really grow in. Your grass growth will be spotty around this clumping and sparse, but if you can keep traffic off it for a couple of years the hay will nourish the new growth, encourage earthworms to inhabit the soils which will make your clay more aerated and spongy, and as the hay deteriorates, the grass will slowly fill in the spots left by too clumpy and thick hay layering.
In the long run it will get you to a natural lawn quicker but I'd seed with native grasses if you want it faster...look around and see what grows in your area the best and try to seed it with that. It will grow better in your soils and you will get faster growth and coverage. In the first year, wait until the grass goes to seed before mowing and set your mower at 4 in. to encourage natural reseeding of your planted grass.
Resist the temptation to mow one last time before fall, which will allow some fall varieties a chance to get their seeds into the mix as well, will not scalp the grasses before a cold spell and will keep your grass more lush in growth for the coming spring.