In January the big oaks and white pines around Rollins Park stand black against a sky the color of an old nickel, and Concord goes quiet in the way only a snowed-in city can. Preservation Tree NH, LLC works beneath them all winter, plowing drives and clearing ground back so a property stays usable while everything above it sleeps. Snow gets moved to where it will not slump across the path again at the first thaw. Entries, walks and turnarounds are opened out to their real width rather than a token lane. Spring will bring the green back on its own schedule; the winter job is simply keeping the way in and out honest.