Oak Park grows a roof over itself — block after block of street trees closing above the pavement until a July afternoon comes down in coins of light. Mowing under that canopy is its own trade: shade grass, root flares, dappled patches that grow at a different pace than the sun-struck strip out by the curb. Davis Tree Care & Landscaping handles the lawn care here, cutting, trimming and tidying yards that live in green half-light. The reward is a yard that reads all one piece from the sidewalk, the line along the walk drawn straight and the clippings carried off. It is steady work in a village that takes its greenery personally.