Midsummer in Pine Brook is heavy and green. Rain moves up the valley, drops its load on the flats, and the grass answers overnight. JT's Lawn Guys works that pace with weekly mowing, edging, string trimming, hedge work and cleanups in spring and fall. A yard cut on time in July looks effortless, which is exactly the point — nobody sees the schedule, only the even color and the trim edge where grass meets blacktop. On these low streets off Bloomfield Avenue, a lawn is a small world worth keeping in order.