In the flat heat of a July afternoon, Lyndeborough goes quiet — the hills above the Souhegan valley haze over, the maples along the dirt roads hang perfectly still, and every lawn on the slope is waiting on water. That is the hour Green Acres Irrigation is built for: irrigation systems set beneath the grass so a yard can drink on its own schedule and hold its green while the hillsides go pale. When the light finally slides off the ridgeline, their landscape lighting takes the evening over — a path, a stone wall, one old maple lit from underneath, the whole property still legible after dark. It is patient work, mostly invisible, and you read it only in the result: turf that stays deep and even straight through August, and a place that looks tended long after the sun is gone. They carry that work across southern New Hampshire, hill town to river town.