In Old Town Fairfax, the historic courthouse where George Washington's will was recorded still anchors brick sidewalks and crepe myrtles flushed pink in the July heat. Craig's Lawn Care looks after lawns in this city where colonial history and busy commuter life share the same blocks. Saturday mornings bring the familiar drone of a mower and the smell of cut grass drifting down the street. Mowing, a careful trim and a sharp line along the curb are the whole of it, done with an eye for how a front yard frames the house behind it. A lawn finished well is a modest thing, but here it fits a place that has long minded its appearance.