Seven in the morning in a borough barely more than a square mile, and the sound of an engine carries three streets over. Riverdale Power Mower keeps its lawns on that early rhythm — mowing, string trimming, edging along walks and driveways, hard surfaces cleared of clippings before the crew moves on. Grass here grows over old glacial stone, so cutting height and pattern change with the ground instead of running the same everywhere. Cleanups arrive in spring and again once the leaves let go. By eight the mower is two doors down, and the first yard already looks like summer.