Nothing smells like a nursery in May — wet soil, warm plastic, ten thousand small green things impatient to be somewhere else. Norris Landscaping and Nursery, Inc. grows, plants and tends around New Haven, where fog sits on the Otter Creek bottomland until the sun gets over the mountains and a freight rolls through the Junction. The lawn work runs right alongside: mowing, trimming, overseeding the thin spots, and the kind of cleanup that strips a winter's worth of sand and matted leaves off a yard in one morning. Plants know this valley's clay and cold well enough to be honest about it. By June, a yard planted in May looks as though it had always been that way.