Rhododendron platypodum

RHS Plant Profile
broad-stemmed rhododendron

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A half-hardy evergreen shrub, usually to about 1.5m high in cultivation, though this species can reach up to 6m in its native habitat. Leaves are thick and leathery, broadly elliptic to rounded, dark matt green with a striking yellow-green midrib, and up to 13cm long, held on short, winged stems. Flowers are produced in tall clusters at the tips of the stems, bearing 12-15 pendent, funnel-shaped soft pink flowers in mid spring

Position

Partial shade

Soil Types

Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1.5-2.5 metres
Max Height
1.5-2.5 metres

Growing Conditions

Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid

Position

Partial shade
Aspect
North–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Ericaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Columnar upright
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
China

How to Grow

Cultivation

In mild, frost-free areas, may be grown outdoors in a sheltered position, in moist but well-drained, humus rich, acidic soil. Position in partial or dappled shade, and add an annual organic mulch (ideally leaf mould). In colder areas, this cultivar is best grown under glass in ericaceous compost. See rhododendron cultivation for more detailed advice

Propagation

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

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Conservatory and greenhouse
  • Flower borders and beds
  • Wall side borders

Pruning

Needs minimal pruning, though restrictive pruning may be required if grown under glass. See pruning group 8 (evergreens) for guidance

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