The National Bonsai Foundation - Supporting the National Bonsai and Penjing Museum at the U.S. National Arboretum. The National Bonsai Foundation became a membership organization in January 2003. Membership in the National Bonsai Foundation includes: The NBF Bulletin, Discounts on NBF Sales Items (10%), Invitations to Special Events at the Museum, NBF Member Decal, The honor and distinction of supporting the world's first and finest bonsai museum.