• Welcome to the U.S. National Arboretum
• About
  • About the Arboretum
  • Strategic Plan
  • Mission
  • Internships
    • Archives Internship
    • Horticulture Internships
    • Research Internships
    • Bonsai Apprenticeship
  • Facilities Use
    • Weddings
  • Photography
  • Contact
• Visit
  • Calendar of Events
    • Hop On Shuttle Saturday & Food Trucks!
    • Earth Day Forest Bathing
    • FONA Garden Fair & Plant Sale
    • World Bonsai Day & Potomac Bonsai Festival
    • FONA's Spring Soiree
    • Spring Bird Walk
    • Hop On Shuttle Saturday & Food Trucks!
    • Spring Bird Walk
    • Spring Bird Walk
    • Azalea Bonsai: Putting on the Glitz
    • Music in the Meadow: Sirius Company
    • Mother's Day Forest Bathing
  • Hours And Directions
  • Map of Arboretum Grounds
  • Rules and Guidelines
  • Teachers
• Discover
  • Plant Finder & Interactive Map (ABE)
  • Gardens & Collections
    • Administration Building
    • Asian Collections
    • Azalea Collections
    • Dogwood Collection
    • Fern Valley
    • Friendship Garden
    • Gotelli Conifer Collection
    • Holly and Magnolia Collections
    • National Bonsai & Penjing Museum
    • National Boxwood Collection
    • National Capitol Columns
    • National Herb Garden
    • Perennial Collections
    • Washington Youth Garden
  • Protecting our Venerable Weeping Japanese Cherry Trees
• Science
  • Plant Hardiness Zone Map
  • Plant Introductions and Releases
    • Plant Introductions - Listed by Genus (A - L)
    • Plant Introductions - Listed by Genus (M - V)
    • Plant Introductions - Listed by Common Name (A - L)
    • Plant Introductions - Listed by Common Name (M - W)
    • Rhododendron Introductions
    • Plant Introduction Fact Sheets and Award Winners
    • Plant Introduction Posters
  • U.S. National Arboretum Herbaria
  • International Cultivar Name Registration
    • Cercis ICRA
    • Lagerstroemia ICRA
• Support
  • Direct Contributions
  • Support Groups
  • Volunteering
• Widgets