Yardville keeps its old trees close — the maples and oaks that lean over the roads running out toward Allentown and hold the whole afternoon up in their branches. Ben Landscaping & Tree Service works in that shade and under it, mowing the lawns below and tending the limbs above. There is a particular satisfaction in a property where the grass is cut clean and the canopy over it is sound, with nothing hanging where it shouldn't. Late summer in this part of Mercer County comes on heavy and green, and much of the work is simply keeping order inside all that growth. When the light finally goes gold across Hamilton Township, the clippings are swept off the walk and the place looks like somebody loves it.