On a June evening the ballfields at Crist Park are full and the grass carries that trampled, sweet smell that means summer has arrived in Frederick. M&M Lawn Services LLC gives the yards nearby the same regard — weekly mowing, trimming around posts and walls, edged borders, and the cleanups that open and close the growing year. When the weather turns, the work turns with it: plowed drives, shoveled walks, ice handled before anyone has to think about it. The satisfying part is pulling away from a property that looks finished, the lines even and the edges sharp against the concrete. That is a good thing to leave behind on any street in the Carbon Valley.