OK, I'm not a lawn guru, but will pipe in as no one else has tried to help you yet.
Sounds like you've tried a lot of good stuff already.
One thing I'd check is how much topsoil you actually have. Get a spade and take a nice sized core sample. You should have at least 6 inches of black stuff. If you have less, then you will have to water frequently to stay green. (I have an area in my lawn where the builder gave me only about 3" of soil plus it's on a slope, so it's always brown if I don't water heavily.)
Secondly, get a soil test kit from Sunnyside and test your soil, or get it professionally tested. You may find that something is off, maybe the lawn has been under or over fertilized. This may help you with choice of fertilizer. I have heard some people recommend trying a new-lawn fertilizer for a while as they are lighter in the salts and have more phosphorous for stimulating root growth.
|