Thunbergia alata Sunny Susy Rose Sensation (Sunny Susy Series)

RHS Plant Profile
black-eyed Susan [Sunny Susy Rose Sensation]

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A fast-growing, tender perennial climber, often grown as an annual, reaching up to 2m high, with heart-shaped, slightly hairy green leaves. Bright pink flowers with a darker centres are produced from mid to late summer

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
1 year
Max Spread
0.5-1 metres
Max Height
1.5-2.5 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
East–facing or 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
Trade

How to Grow

Cultivation

Thrives in fertile, moist but well-drained soil, in full light with shade from hot sun. Provide support for climbing stems. Plants are not frost tolerant; overwinter in a conservatory or greenhouse

Propagation

Propagate by seed sown at 16-18°C (61-64°F) in spring, by softwood cuttings in early summer, or by layering

Suggested planting locations and garden types

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

Pruning

Minimal pruning required, see pruning group 11

Pests

May be susceptible to aphids, and to red spider mite and glasshouse whitefly under glass

Diseases

May be susceptible to powdery mildews