On Savannah's southside the live oaks lean over the Georgetown streets and let the light down in coins. HP Irrigation & Landscaping LLC mows and maintains the lawns beneath them — thick tidewater turf that grows nearly as fast as it can be cut — edging the drives and trimming close at the base of the palmettos. From April on, a steady cutting cycle is the only thing that keeps a yard from getting away. Thunderheads stack over the marsh and let go by four most afternoons, so the hours that count are the early ones. What the day leaves behind is a lawn level as a tabletop and a walk with no clippings on it at all.