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Rhododendron arboreum

tree-like rhododendron

R. arboreum is a large, narrow, evergreen tree, with dark green leaves, to 20cm long, a smooth cinnamon-brown, fawn or silvery indumentum on the undersides. Flowers, produced in rounded trusses in early spring, are up to 5cm long and may be red, white or any shade of pink, usually with spotting in the throat

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Size
Ultimate height
8–12 metres
Time to ultimate height
20–50 years
Ultimate spread
2.5–4 metres
Growing conditions
Loam
Sand
Moisture
Moist but well–drained
pH
Acid
Colour & scent
StemFlowerFoliageFruit
Spring Pink Red White Green Grey Silver Brown
Summer Green Grey Silver Brown
Autumn Green Grey Silver Brown
Winter Green Grey Silver Brown
Position
  • Partial shade
Aspect

South–facing or North–facing or West–facing or East–facing

Exposure
Sheltered
Hardiness
H4
Botanical details
Family
Ericaceae
Native to the UK
No
Foliage
Evergreen
Habit
Columnar upright
Genus

Rhododendron can be evergreen or deciduous shrubs or trees, with simple leaves, sometimes with a dense colourful indumentum of hairs on the lower side, and funnel-shaped, bell-shaped or tubular flowers that may be solitary or in short racemes

Name status

Correct

Plant range
India & Sino-Himalaya

How to grow

Cultivation

Grow in moist but well-drained, leafy, humus-rich acid soil in part shade with shelter; see rhododendron cultivation

Propagation

Propagate by seed when ripe, or semi-ripe cuttings in late summer, layering in autumn or grafting in late summer or late winter

Suggested planting locations and garden types
  • Architectural
  • Cottage and informal garden
  • Low Maintenance
Pruning

Pruning group 8

Pests

May be attacked by vine weevil, rhododendron leafhopper, pieris lacebug, scale insects, caterpillars and aphids

Diseases

May be affected by various Rhododendron diseases including powdery mildews, rhododendron petal blight, rhododendron bud blast, silver leaf and honey fungus

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