Stand on the Eastern Promenade in July and Casco Bay lays its islands out like stepping stones, ferries stitching between them all afternoon. Casco Bay Lawn Care Inc takes its name from that water and its schedule from the grass, mowing the small sloped yards that step down toward the harbor and trimming the corners no mower can reach. Salt air, thin soil and a short growing season make a Portland lawn a particular project, one that answers to a steady weekly hand. Spring cleanups clear the grit the plows left behind; fall cleanups lift the leaves before they turn to mat. The result is simple and worth the trouble: a cut lawn, a clean edge, and a view that does the rest.