Danbury weather arrives in layers off Candlewood Lake — August haze pooling in the Still River valley, October light turning thin and gold along the ridges, then the heavy wet snow these western Connecticut hills seem to invent on their own. Keller Lawn and Landscape works to that calendar: weekly mowing with the edges cut clean, fertilization, aeration and weed control, shrub, hedge and tree pruning, spring and fall cleanups, leaf and storm-debris removal, mulch laid dark around new plantings, and plowing that opens a driveway before the first alarm clock on the street goes off. They also build the parts meant to outlast a season — custom paver patios, retaining walls, pathways, driveways and steps, fire pits and outdoor fireplaces, landscape design and garden installation, outdoor lighting, and drainage and grading that finally sends the water where it should have gone all along. The satisfaction is plain and physical: a lawn holding its stripe into evening, a stone path settling into the slope behind an old Hat City house, a yard that reads as tended from the sidewalk. That care runs out from Danbury through Bethel, Brookfield, Ridgefield, Newtown and New Milford.