Along Carlisle's eastern boundary the Concord River moves slow and brown through the meadows, and the grass on the rise above it comes in thick by the middle of May. Aquino Landscaping & Construction LLC mows and trims in that river-bottom part of town, where the soil holds water long after the pavement has dried. Reading a lawn here means knowing which low corner to cut first and which to leave for the warm part of the afternoon. Twice a year the cleanups come through — winter's scatter of sticks in April, the oak leaves in November — and the yard gets its shape back. Then the best part: a straight stripe running out toward the pines, and an edge crisp enough to throw a shadow of its own.