September comes gently to Felton. The light goes low and long over the stubble fields, the creek hollows cool first, and the grass slows without stopping. Streamline Lawn & Tree LLC keeps mowing into the shortening weeks, trimming and edging, then moving to leaf cleanup once the maples start dropping. A yard cut and cleared now holds its shape all the way to the hard frost. That is the aim in this corner of southern York County: a place that still looks its best when the mowing is over for the year.