Arlington gives out its green in small, generous portions: a strip between the porch and the sidewalk, a back lot about the size of a rug, a slope behind a two-family. P & C Landscape Contractors works at that scale, where every edge is visible from the street and nothing can hide. Mowing, trimming, hedge work, mulch, the spring and fall cleanups that bracket the year, all of it close-quarters and all of it in plain view. On a bright day the light off Spy Pond seems to raise the whole neighborhood a shade brighter. Small yards done exactly right make a street look cared for, and that is the point.