April in Georgetown arrives as sound before it arrives as color — Penn Brook running loud, the ground letting go, everything soft underfoot for a couple of weeks. Groundswell Landscape LLC uses that turn to open the season: cleanups, raking winter's grit and sand out of the turf, cutting the beds back in, fresh mulch, then the first mow once the ground firms up. From there it runs weekly all summer, edges held sharp, clippings carried off. Watching a gray yard come back green under a few weeks of that is reason enough to do the work. Lawn care for Georgetown, Groveland, Boxford and Haverhill.