Thunbergia alata 'Sunrise Orange' (Sunrise Series)

RHS Plant Profile
black-eyed Susan 'Sunrise Orange'

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black-eyed Susan 'Sunrise Orange' RHS
Annual Biennial

A tender, evergreen fast-climbing annual with heart-shaped leaves and masses of bright orange flowers with black centres. Ideal for covering fences, trellis and gates

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
1-1.5 metres

Growing Conditions

Chalk Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–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)
H2

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Acanthaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Climbing
Genus
Thunbergia can be annuals or perennials, often twining climbers, with simple opposite leaves and trumpet-shaped or salver-shaped flowers borne singly in leaf axils, or in racemes, in summer
Name Status
Unresolved

How to Grow

Cultivation

Grow in well-drained soil in full sun with a support for the plant to climb

Propagation

Propagate by seed or if grown under glass, propagate by semi-ripe cuttings in late summer

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wall side borders

Pruning

No pruning required outdoors. If grown under glass, pruning group 11

Pests

Aphids may cause problems and various pests such as glasshouse red spider mite, glasshouse whitefly and scale insects may be a problem under glass

Diseases

May be susceptible to powdery mildews