On a July afternoon Onota Lake turns the color of hammered tin, and the yards on the roads above it hold their heat until evening. Berkshire Lawn Care works that ground — mowing, trimming back what has run wild, cutting the edges along walks and drives, raking off the clippings so the green looks deliberate. Pittsfield grass grows fast and late in this valley, and keeping pace with it is a matter of rhythm more than force. The reward is small and real: a lawn that looks finished the moment the light goes gold at seven o'clock. Lawn care in Pittsfield and the towns that ring it.