The ground under Perinton was left here by the ice — heavy clay, packed tight, the kind of soil that closes up on itself after a long winter. Affordable Lawn Aeration opens it again, pulling cores so rain and air and root can reach down to where the work actually happens. September is the month for it in this town, when mornings turn cool over the fields on the east side and grass wakes up hungry again. A lawn that looked thin and tired in August comes back thick by the time the maples turn. It is slow, unglamorous work, and the result shows up weeks later in a color you can read from the sidewalk.