Central Islip has wide old campus lawns and brick that has weathered a century, and a village that grew up around them. Greenview Garden Landscaping Corp. tends the household-sized version of that on the residential streets — beds shaped and mulched, shrubs pruned back to breathing room, grass mowed and edged so the border between lawn and garden stays a line instead of a smudge. Spring is planting and undoing whatever winter wrecked; midsummer is upkeep, water and shears; autumn is the long haul of leaves. A garden is a slow conversation with a piece of ground. They keep answering it, season by season.