On a July afternoon the St. Clair River runs blue and fast under the Blue Water Bridge, and a thousand-footer slides down past Desmond Landing with a wake that reaches the seawall a full minute later. Sein Brothers Lawn Care L.L.C cuts the yards that watch that traffic go by, and just as many that never see the water at all. Weekly mowing, string trimming around posts and downspouts, edges cut so a driveway keeps a clean shoulder — the work is repetitive on purpose, because repetition is what keeps turf thick. August heat comes hard off the water, so the deck goes up a notch and the grass keeps its color when the sky refuses to help. By the time the mowers are loaded, a lawn looks brushed, striped and squared to its corners. That is the whole point of the day.