The slopes above Mount Auburn Street hold some of the oldest turf in Cambridge, and grass with that much history under it answers a regular hand. t.davis lawn service mows, edges and trims those lawns through the season, keeps beds mulched and takes the cleanups at both ends of the year. Shade from big old trees changes everything: the cut goes higher, the passes go slower, and the lawn comes back thicker for it. Late in the season, when light comes sideways through the branches, a freshly cut yard looks about as good as a city yard can. That is the part worth showing up for.