A mowing route through Ferndale develops a rhythm of its own: same day, same streets, the block knowing roughly when the sound will show up. Yard Patrol Co. holds that rhythm — the cut done on the same weekday, the trimmer run around beds and posts, the walk edge kept sharp. Because so many houses here sit near the curb, a lawn left too long is obvious and a lawn kept up gets noticed without anyone saying so. The aim is uncomplicated: come back before the grass gets ahead of anybody. Ferndale is the core of the route, with Oak Park, Hazel Park, Berkley and Royal Oak riding along with it.