In May the mill pond at Frank Melville Memorial Park sits glassy under new leaves, the swans keep up their slow patrol, and every lawn in East Setauket comes on at once. Green is the Color Lawn Care keeps pace with that rush — mowing, trimming, edging and seasonal cleanups across the Setauket villages. Sandy north-shore ground and salt air ask a lot of a lawn, which is exactly why steady cutting shows so plainly. A yard trimmed tight to the fence line and edged along the drive reads as cared-for from the road. From the opening spring cut to the last fall cleanup, that is what the week is built around.