On late August evenings near the Bent of the River the light goes gold over the fields and the swallows work the air until dark. That is the hour QJF Tree Services LLC aims for: the mower shut off, the edges trimmed, the clippings gone, a lawn that looks composed rather than merely cut. The work behind it is unglamorous, week after week of mowing, trimming and edging, beds mulched and weeded, spring and fall cleanups carried off by the truckload. Southbury yards run to slope, ledge and shade, so no two properties get the same pass. Done right, nobody notices the effort; they only notice the yard.