At dusk the fields toward the Hillsborough side go blue, and the last mowers of the day shut down one at a time. Yager Lawn Maintenance LLC keeps that kind of schedule across Franklin Township — mowing, trimming, edging and cleanups from the first flush of spring to the last leaf down, then plowing, walkway clearing and salt work once the ground hardens. Maintenance is an unglamorous word for something that actually takes attention: knowing which yards drain slow, which drives ice up first, which corners the wind fills back in. Along a route, that knowledge is most of what is really on offer. The rest is showing up with the machine that fits the weather.