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Rhododendron 'Gibraltar' (K)
  • RHS AGM

rhododendron 'Gibraltar'

A deciduous azalea of open habit to 1.5m tall, with deep crimson-orange buds opening in spring to large, slightly-frilled, rich orange flowers with a deep yellow flare, borne in late spring

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Size
Ultimate height
1–1.5 metres
Time to ultimate height
10–20 years
Ultimate spread
1–1.5 metres
Growing conditions
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid
Colour & scent
StemFlowerFoliageFruit
Spring Orange Green
Summer Green
Autumn
Winter
Position
  • Full sun
  • Partial shade
Aspect

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

Exposure
Sheltered
Hardiness
H6
Botanical details
Family
Ericaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Harmful if eaten. Wear gloves and other protective equipment when handling
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

Accepted

Horticultural Group
Knap Hill and Exbury azaleas are vigorous deciduous shrubs with large, oblong leaves, and usually fragrant, trumpet-shaped flowers in shades of yellow, orange, red and white, in mid and late spring

How to grow

Cultivation

Suitable for an open site but best grown in moist but well-drained, leafy, humus-rich acid soil in part shade with shelter; see rhododendron cultivation

Propagation

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

Suggested planting locations and garden types
  • Cottage and informal garden
  • City and courtyard gardens
  • Flower borders and beds
Pruning

Pruning group 1

Pests

May be susceptible to vine weevil, rhododendron and azalea whitefly, rhododendron leafhopper, pieris lacebug, scale insects, caterpillars and aphids

Diseases

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

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