On a July morning in Atlanta the water oaks hold the heat off for an hour or two, and the city's lawns — the narrow strips between sidewalk and porch, the deep ones out back — do most of their growing before noon. Blue Sky Landscape Company works that window. Mowing, trimming along fences and stair rails, edging where turf tries to creep over the walk, then blowing the cuttings back onto the grass instead of into the street. In a city of small yards the border is what people see, and getting it right is most of the job. Atlanta neighborhoods and the towns just outside them are all served.