Silver Lake is a tight grid of porches and driveways above the Second River, where the yards are small, the neighbors are close, and every square of grass counts double. Silver Mountain Landscaping mows those lots — quick, careful work on properties measured in steps, with fences and stoops and hydrangeas to cut around. In spring, when the cherry trees blossom in the park just south of here and the whole valley goes pink for two weeks, it is a fine time to be outside working. A crisp edge along a city sidewalk changes how an entire block reads. Week after week, that is the job.