I have a back yard with moderate shade and a large bare spot. This yard had a nice stand of grass about two years ago and then began to thin ( and now nothing). I had a soil sample taken and the results where good ( ph-ok, soil make-up--ok, ) dosen't make sense. Aerated and overseeded last fall with a shade mix grass, the grass came up , looked great , and now this spring ( nothing but mudd). Can anyone suggest anyting that might help ?