The beauty you will find along these walks is truly breathtaking. Our collection of trees includes some of the largest and most unusual on Long Island: a 105-foot tulip tree, a Japanese Pagoda Dogwood tree, and an 91-year-old American Elm, to name a few. Unique plantings bear the mark of the arboretum's regal beginnings. In the 1920s, for example, gardeners from the Post family estate created a Tabletop Scotch Elm by grafting two elm varieties together resulting in a grainy bark at the base of the tree, and a smooth bark at the top. The contrast is striking. Gardeners also planted a formal flower garden next to the Administration Building where brick walls, walkways and benches still stand today as a testament to a gentler time. The arboretum as a whole is a tribute to the natural beauty of Long Island's famed Gold Coast.