Rhododendron johnstoneanum 'Double Diamond'
Common name: 
Double Diamond (Johnstone) Rhododendron
ro-do-DEN-dron jon-sto-NE-an-um
Native to (or naturalized in) Oregon: 
  • Broadleaf evergreen shrub, to 4 ft (1.2 m), young branches scaly and bristly.  Leaves alternate, simple, 5-10 cm long, 2-4 cm wide, elliptic or slightly obovate, rounded or obtuse at the apex, slightly narrowed at the base, upper surface dark green, shining, midrib grooved, densely scaly beneath, fringed with hairs when young; petiole 0.5-1.3 cm long.  Flowers funnel shaped, 3-4 in terminal clusters, fragrant, pale creamy yellow, or pale yellow or nearly white, with yellow-green in the throat, double, reminiscent of a gardenia flower.  The species (Rhododendron johnstoneanum) has produced several double flowered plants.
  • Hardy to USDA Zone 7.
  • johnstoneanum: after Mrs. Johnstone, wife of the Political Agent, Manipur, India, 1882.
  • Federal Way, Washington: Rhododendron Species and Botanical Garden.
Click image to enlarge
  • plant habit, flowering

    plant habit, flowering

  • plant habit, flowering

    plant habit, flowering

  • flowers and leaves

    flowers and leaves

  • flower


  • young leaf

    young leaf