Rostraver keeps a good deal of open ground — hayfields, church lawns, the wide flat sky over the township airport where small planes come and go all afternoon. GSG LAWNCARE & LANDSCAPING works in that light, the bright noon of a western Pennsylvania July when the mower is the only sound for a quarter mile. Big lawns get cut in long unbroken passes; small ones are finished by hand at the trimmer. Grass grows thick in the bottoms and thin on the ridge, and reading that difference is what separates a cut lawn from a good-looking one. Every stop ends with the edges tightened and the pavement clear.