(DC) (Friends of the National Arboretum) Join FONA for a walking tour of the U.S. National Arboretum Gotelli Conifer Collection with longtime curator Joe Meny. One of the most unique horticultural displays at the Arboretum, the Gotelli Conifer Collection offers a special beauty in the winter months. This fascinating collection contains a range of colors, forms, and textures that are sure to leave you in awe of the diversity of conifers.