For anyone in the business of plants, Marder's Nursery is an institution. Located on Snake Hollow road in Bridgehampton, it has the most incredible specimen trees I have ever seen. My father's house has a Weeping Hemlock he purchased 25 years ago, and it is a work of art. Note that the prices are not normal prices for a Nursery. However, if you have the budget, or just want to browse, Marder's is kind of like an outdoor museum.