April rain sits on the Chestnut Hill Reservoir like fog on glass, and every lawn in Brighton wakes up hungry. Grove Street Services meets Boston's spring head-on: raking out the winter's grit, cutting low that first time, feeding and overseeding the bare shoulders that road salt burned. Then comes the long steady middle of the year — mowing on a weekly line, edging, trimming, mulch where beds meet grass. By November the leaves are taken away before they smother anything underneath. Steady beats spectacular, and a lawn kept that way rarely has a bad month.