Harvard sits on black prairie ground that will grow anything you point it at, and by mid-April the lawns are already ahead of everybody. That first mow of the year is Cesar's Lawn & Landscaping Inc.'s favorite kind of morning — the deep green smell coming up off the blades, a yard two shades brighter than it was an hour before. From there it settles into rhythm: mowing, trimming, edging, and the clippings hauled off so the walks stay bare. The section roads out here run a mile apart and the routes follow them, one square of country at a time, right up to the frost. Lawn care in Harvard, Alden and the farm country around them.