Fog settles low on the Chattahoochee below Martin's Landing on an April morning, and it burns off just about the time the first mower starts up. D-N-D Lawn Care runs the river-side neighborhoods, where lawns fall away toward tree lines and everything grows fast once the nights turn warm. Weekly mowing, edging along drives and walks, string trimming at fences and posts, clippings put back into the turf where they do some good. Grass in this stretch of Fulton County wakes in early spring and does not slow down until the leaves turn, so a schedule kept is worth more than any single heroic visit. They work Roswell along with Sandy Springs, Dunwoody and Johns Creek.