Out on the sandy ridges of North Twiggs the ground is old and thin, longleaf pine standing over wiregrass, and the yards carved into it have a character all their own. VBF Lawn Services mows and edges these places in April, once the pollen finally washes off and the grass takes a real color. Trimming close along the drives and around the pines, sweeping the walks clear, holding a firm line where lawn gives way to sand — that is the difference between a yard and a clearing. Sandhill ground rewards attention more than it rewards effort. Giving it that attention, visit after visit, is the whole idea here.