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Rhododendron decorum AGM

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© RHS

Characteristics

Plant type

Shrub or Tree

Habit

Bushy

Fragrance

Flower

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

White in Spring

Foliage

Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

4-8 metres

Ultimate spread

1.5-2.5 metres

Time to ultimate height

10-20 years


Preferred common name

great white rhododendron

Family

Ericaceae


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

R. decorum is a large evergreen shrub or small tree, with oblong leaves, pale beneath, and trusses of large, strongly fragrant, funnel-shaped white or pink-tinged flowers, greenish-yellow in the throat

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, West-facing or East-facing
  • Sheltered

Cultivation

Grow in moist but well-drained, leafy humus-rich, acid soil. Shallow planting is essential, deep planting will not be tolerated

Soil

  • Moist but well-drained
  • Acid
  • Sand, Clay or Loam

Propagation

Propagate by seed or semi-hardwood cuttings. Cultivars will not come true from seed

Suggested planting locations and garden types

Banks and Slopes, Cottage/Informal Garden, Flower borders and beds, Hedging/Screens, Low Maintenance, Patio/Container Plants or Wall-side Borders


How to care

Pruning

Pruning group 8

Pests

May be attacked by vine weevil, leafhoppers, lacebugs, scale insects, caterpillars and aphids