Granite lies close to the surface in south Rockdale County, and Big Haynes Creek cuts through it on its way toward the Yellow River. Prime Lawn LLC works the yards above that stone — mowing, edging, trimming and clearing, on ground that goes thin and dry wherever the rock rises. Summer mornings start early here, before the heat lifts off the pavement south of Conyers. Grass on shallow soil needs a lighter, smarter cut, and it pays back a careful one. A yard held green over granite is a small argument won every single week.