Wind crosses Whitehall Lake in June and moves through the grass in long silver waves — the same wind that dries a lawn just in time to cut it. Bemis Landscaping works Hopkinton's yards through the green months: mowing on a set week, string trimming the edges, cutting a clean border along beds and walkways, refreshing mulch, and clearing the yard out in spring and again in fall. The ground here is glacial — ledge, stone wall, and a sudden dip where the mower has to slow down. Learning the shape of a property is half of making the result look effortless. The other half is coming back before it needs you to.