In June the grass along the Assabet's banks grows faster than anyone quite believes, and a Hudson yard can go from tidy to shaggy in five days flat. Green Leaves Landscape stays ahead of it with weekly mowing, trimming around trees and foundations, and edges cut so the lawn stops exactly where it should. Spring means beds cleaned out and mulched; November means leaves lifted off the turf before they mat down and smother it. Then the calendar turns and the same driveways get plowed, the same walks shoveled, sand spread where shade holds ice well past noon. A lawn kept up all summer and a driveway kept open all winter, for the same houses, cared for either way.