Riverhead begins at a river that changes its mind — fresh water sliding past Grangebel Park, spilling over the dam, then widening east until it decides to be a bay. In April, when that water runs loud and the willows go gold-green, the mowers come out and the first cut of the year happens on ground still soft from the thaw. 4 Seasons Sandoval Landscaping works these lawns straight through the growing months, holding the height right through July heat and keeping beds edged clean against sandy East End soil. There is a real pleasure in the last pass of the day: stripes lying straight, clippings blown off the walk, nothing left behind but green. When the maples finally let go, the same yards get cleaned down to the grass and put to bed for the cold.