The old airfield ground at Union Point in South Weymouth lies wide and treeless, and July heat sits on it until a breeze finally comes up in the afternoon. Amazing Landscaping Corp works properties across that open end of town — mowing, edging, trimming, and the cleanups that open the spring and close out the fall. Big exposed lawns burn fast in a dry stretch, so cutting a little higher and keeping a sharp blade is the difference between green and straw. Nothing beats the look of a large lawn finished in one continuous rhythm, borders trimmed, clippings cleared, the whole thing reading as a single piece. In October the leaves arrive from every direction, and the work turns to moving them out.