Rhododendron arboreum (Tree Rhododendron)


Botanical Information

FamilyEricaceae
GenusRhododendron
Speciesarboreum
CategoryWoody
TypeShrub (evergreen)
OriginNative to Bhutan, China, India, Myanmar, Nepal, Sri Lanka, Pakistan and Thailand.

Details

USDA Hardiness Zone7b - 8a
USDA Hardiness Ref.
Canadian Hardiness Zone8
Canada Hardiness Ref.
RHS Hardiness ZoneH4-H5
RHS Hardiness Ref.
Temperature (°C)-17.8-(-6.7)
Temperature (°F)0-20
Height8-12 m
Spread2-4 m
Flowering PeriodMarch, April, May, June

Description and Growing Information

General DescriptionIn 1993 this tree was discovered on Mount Japfu in India. The tree holds the Guinness Record for the tallest Rhododendron at 32 metres. It was measured at the time of discovery but is still growing.
PropagationPropagated by seed.
CultivationGrows best in well drained, moist soils and partial sun.
Notable SpecimensTrewidden Garden, Cornwall, England. Lanhydrock House and Garden, Bodmin, Cornwall, United Kingdom.
HabitatFound in various altitudes and in dense forest areas.
Leaf DescriptionThe broad, dark green leaves are 10-20 cm long. The underside of the leaves are silvery.
Flower DescriptionIn the spring 15-20 bell-shaped flowers grow, reaching 5-6 cm long and 5 cm wide. They are dark pink to ruby red.

Photographs