Mid-July in the valley, and by two in the afternoon the air over a New Hartford lawn shimmers a little. Superior Mowing goes out anyway, cutting, trimming and edging on the week-by-week rhythm that keeps grass from getting away from a homeowner. Done properly, a mowed lawn holds its shape for days — even passes, a firm border at the driveway, nothing ragged along the fence. That is the whole ambition here, repeated across a lot of yards in a lot of neighborhoods. Grass is cut in New Hartford, Whitesboro and the streets running west toward Oriskany.