In this month's episode of This Old Tree, host Doug Still introduces you to The Imperial Pine Bonsai. The stately "Imperial Pine" is the only bonsai ever to leave the Japanese Emperor's collection, and it resides at the National Bonsai & Penjing Museum at the U.S. National Arboretum in Washington, DC. Listen to the behind-the-scenes story about how it got there during a critical moment in diplomatic history between Japan and the United States.