Rhododendron (Tortoiseshell Group) 'Tortoiseshell Orange'

RHS Plant Profile
rhododendron 'Tortoiseshell Orange'

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A half-hardy, bushy evergreen shrub to 2m high, with ovate, leathery dark green leaves. Produces loose clusters of funnel-shaped, soft orange-red flowers to 8cm across, in mid to late spring

Position

Partial shade

Soil Types

Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1-1.5 metres
Max Height
1.5-2.5 metres

Growing Conditions

Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid

Position

Partial shade
Aspect
East–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
Bushy
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
Accepted

How to Grow

Cultivation

In mild, frost-free areas, may be grown outdoors 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, may be grown under glass in ericaceous compost. See rhododendron cultivation for more detailed advice

Propagation

Propagate by semi-hardwood 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
  • Coastal
  • Flower borders and beds
  • Wall side borders
  • Conservatory and greenhouse

Pruning

Pruning group 8 (evergreens)

Pests

May be susceptible to vine weevil, whitefly, rhododendron leafhopper, lacebugs, scale insects, caterpillars and aphids

Diseases

May be susceptible to rhododendron diseases including rhododendron bud blast and rhododendron petal blight, as well as powdery mildews, honey fungus, rust, leafy gall, silver leaf and Phytophthora root and shoot rots