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  • Rhododendron arboreum

Rhododendron arboreum

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Common name: Himalayan tree rhododendron


The famous Rhododendron arboreum is one of the world’s tallest rhododendrons. Plants can grow to an incredible 40 m (130 ft) high. It is a variable species with a range that includes the mountains of western China and adjacent Vietnam, Myanmar and India, northern Thailand, Nepal, Bhutan and Sri Lanka.


Tree rhododendron’s thick, leathery leaves are mostly oblong to about 20 cm (8 in) long. The flowers are borne in rounded trusses of about twenty flowers. The species can vary in leaf size, white to dark brown indumentum (felty-like hairs on back of leaves), and flower colour. The flower colour can be white, and various shades of lavender, pink and red.


R. arboreum subsp. cinnamomeum var. album is native to Nepal. This white-flowering tree has leaves a little shorter than those of a tree rhododendron, with a two-layered indumentum. The lower layer is whitish to fawn-coloured, while the upper layer is rust-coloured, loose and woolly. This is not the rhododendron species in Nepal that the much sought after Mad Honey comes from, but the bees still love it.  In 1820 Dr. Nathaniel Wallich collected its seeds in Nepal and sent them to a variety of places in England. 


The pictures were taken in the Sino-Himalayan Garden in early May on the trail going through bed 122. You can also find this tree rhododendron growing in the Fern Dell and at the beginning of the Rhododendron Walk. 


Text and photos by Hughie Jones

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  • Home
  • Updates
    • What's New
    • Extra Credit News
    • Garden Stories >
      • Garden Story Index
    • Self-Guided Tours
    • Curator Updates
    • Guide Training
    • Walks & Talks >
      • Walks and Talks 2023
      • Walks and Talks 2022
      • Walks -Talks 2021 & Zoom Tips
    • PDFs of Updates, Tours, & Talks >
      • Self-guided Tours (PDF)
      • Gardener Walks (PDF)
  • Plant IDs
    • ID By Flower Color >
      • Red Flowers
      • Pink Flowers
      • Orange Flowers
      • Yellow Flowers
      • Green Flowers
      • Blue Flowers
      • Purple Flowers
      • White Flowers
    • ID By Type >
      • Annuals
      • Berries-Fruits-Nuts
      • Bulbs, Corms, Rhizomes, Tubers >
        • Bulbs
        • Corms
        • Rhizomes
        • Tubers
      • Ferns
      • Grasses
      • Medicinal Plants
      • Native Plants
      • Perennials >
        • Peonies
        • Salvias
      • Rhododendrons >
        • Rhodendron Erica Notes
      • Shrubs >
        • Calycanthus
        • Hydrangeas >
          • Hydrangea Background
        • Peonies >
          • Peonies-Overview
        • Rhododendrons
        • Roses >
          • Rose Background
      • Trees >
        • Conifers >
          • Cypress
          • Firs
          • Pines
        • Deciduous Trees >
          • Dogwoods
          • Ginkgos
          • Magnolias
          • Witch Hazels
        • Native Trees
        • Tree of the Month
  • In the Garden
    • Map and Collection Lists >
      • Plant Locator
    • Art in the Garden >
      • Symposium & Exhibitions
    • Building and Grounds >
      • Bridges
      • Formal Rose Garden Hardscape and Art
      • Grotto Area & Black Garden
      • Korean Pavilion
      • Maze
    • Gardener Assignments
    • Collections >
      • Ash Collection
      • Camellia Collection
      • Rhododendron Walk
    • Gardens >
      • Gardens A-D >
        • Alma VanDusen Garden
        • Backyard Bird Garden
        • Bentall Garden
        • Black Garden
        • Canadian Heritage Garden >
          • Bees
          • Canadian Heritage Orchard
        • Cascadia Garden
        • Cherry Grove
        • Chilean Garden
      • Gardens E-H >
        • Eastern North America Garden
        • Fern Dell
        • Formal Rose Garden
        • Fragrance Garden
        • Heather Garden
        • Herb Garden
        • Heritage Rose Garden
      • Gardens I-P >
        • Laburnum Walk
        • Livingstone Lake
        • Meconopsis Dell
        • Meditation Garden
        • Mediterranean Garden
        • Ornamental Grasses
        • Perennial Garden
      • Gardens R-Z >
        • Rhododendron Walk
        • Sino-Himayalan Region
        • South African Garden
        • Southern Hemisphere
        • Stone Garden
        • Vegetable Garden
        • Woodland Garden
    • Garden History >
      • History photos
  • Science
    • Animals & Insects >
      • Birds
      • Butterflies and Moths
      • Insect Friends
      • Small Creatures
    • Buds
    • Colour and Vision
    • Dynamic Symmetry - Fibonacci Spirals
    • Flowers
    • Fruit
    • Germination
    • Habitats and Environments
    • Hormones
    • Leaves
    • Life on Earth
    • Light, Energy, and Rainbows
    • Plant Calendars
    • Pollination
    • Pollen
    • Roots
    • Scents
    • Seeds
    • Soil
    • Stems
    • Vascular Plants
    • Web of Interdependence
    • Weeds
  • Bloedel
  • Search
    • Internet links
  • About
    • ERICA, ERICA'S TREE (and a short history of Guiding) - June 14, 2018
  • Contact