Sound carries strangely in Concord — over the white pines toward Walden, across a frozen field, down a street where nothing else is moving yet. EcoQuiet Lawn Care works in that hush both halves of the year: mowing, trimming, edging and seasonal cleanups while the ground is soft, plowing, shoveling and salting once it isn't. There is a particular satisfaction in a driveway opened before the household wakes, blade-clean to the pavement, the walkway squared off at the steps. Summer has its own version of the same idea — the lawn striped even, the trim line following the foundation without a wobble. Concord and its neighbors, without much noise about it.