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Rhododendron macrophyllum

An evergreen shrub, 2-4m high, with an upright, branching habit, and elliptic, dark green leaves up to 15cm long. Produces clusters of 20 or more bell-shaped flowers, in shades of rose pink, purple and occasionally white and with yellow-brown speckles on the upper petals, in late spring

Synonyms
Rhododendron californicum
Ledum macrophyllum

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Size
Ultimate height
2.5–4 metres
Time to ultimate height
5–10 years
Ultimate spread
2.5–4 metres
Growing conditions
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid
Colour & scent
StemFlowerFoliageFruit
Spring Pink Purple White Green
Summer Green
Autumn Green
Winter Green
Position
  • Partial shade
Aspect

North–facing or West–facing

Exposure
Sheltered
Hardiness
H6
Botanical details
Family
Ericaceae
Native to GB / Ireland
No
Foliage
Evergreen
Habit
Columnar upright, Spreading branched
Potentially harmful
Harmful if eaten. Wear gloves and other protective equipment when handling. Pets (dogs, cats, rabbits, tortoises) Harmful if eaten - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
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
USA & Canada

How to grow

Cultivation

Grow in moist but well-drained, humus rich, acidic soil, in partial or dappled shade. Choose a site away from frost pockets and sheltered from strong winds, and do not allow plants to dry out. Mulch annually, ideally with leaf mould. See rhododendron cultivation for more detailed advice

Propagation

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

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

Minimal pruning required, see pruning group 8 (evergreens)

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 powdery mildews, honey fungus, silver leaf and Phytophthora, as well as more specific Rhododendron diseases

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