Under a stand of Decatur oaks there are always patches where grass has flatly refused for years — too much shade, too much clay, too many dog laps worn around the same track. Waterloo Turf Atlanta Artificial Grass puts something else there: artificial grass laid over a graded, draining base, cut and seamed to the shape of the yard, so the ground stays green in February and does not go to mud in a March downpour. Pet areas, small play spaces, backyard putting greens — the work is measuring, grading and fitting, and it lives or dies on the base underneath. Rain arrives hard and fast here, so it gets built to take it. After that it is simply green, in the shade, all year.