As of 2005, the Oregon Garden includes more than twenty specialty gardens and features such as the Bosque, Children's Garden, Conifer Garden (one of the largest collections of dwarf and miniature conifers in the United States), Honor Garden, Hughes Water Garden, Jackson &amp; Perkins Rose Garden, Lewis &amp; Clark Garden, Northwest Garden, Pet Friendly Garden, and Sensory Garden. The water garden is a maze-like area with numerous paths and bridges. A native Oregon white oak grove includes the 400-year-old, Signature Oak, which is one of Oregon's Heritage Trees. The garden holds an annual festival each autumn. Also on the grounds is the Teufel Amphitheater which hosts concerts and other events; Sam Bush played in the Amphitheater in 2006.