Anyone who has walked the beech allée at Planting Fields knows what a well-kept green thing looks like on this stretch of the North Shore, and the neighborhoods around it hold themselves to that. Louis Contino Landscaping mows, trims hedges, edges beds and runs the seasonal cleanups on properties in the same salt air. Hedge work is slow and geometric — sight down the line, take a little, look again — and a hedge cut true will keep its face for weeks. Hydrangeas tolerate the fog here better than most things, and an even lawn underneath them makes a yard read finished. It is ordinary work, done carefully, on a piece of coast that notices.