I live in SE Wisconsin. The soil conditions at our new house are very poor: 4" of very poor quality dirt on top of pure, fine sand. Two attempts to grow grass have failed. The cost of excavating 4", bringing in good top soil, and seeding/fertilizing again will be very expensive. The grading precludes just putting topsoil on top of what I have now. I've found some info on the web about this situation. Suggestions are to work in organic material into the poor soil and look for a seed blend made for full sun/sandy soil (I suspect the landscaper just used his usual seed blend each time). I could give this one more try in the fall. Has anyone tackled a situation like this successfully without excavating? Thanks.