The island still has hills at its north end, where Inwood and Washington Heights climb above the Harlem River and the ground remembers it was once schist and forest. J Flores Landscaping & Maintenance LLC starts the day up that way, truck loaded before the traffic thickens on Broadway. The work is mowing, trimming, edging and seasonal cleanups — lawns behind buildings, strips along entryways, small yards that would go wild inside a month without attention. Leaving a block greener than you found it is its own kind of pay. Serving Manhattan, uptown through downtown, and nearby parts of the city.