Thunbergia grandiflora

RHS Plant Profile
blue trumpet vine

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blue trumpet vine RHS 2002
blue trumpet vine visionspictures.com
blue trumpet vine visionspictures.com

Other common names

Bengal clock vine, blue skyflower, clock vine, sky vine, skyflower

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A very vigorous, twining, evergreen, woody-stemmed perennial climber to 6m or more, with heart-shaped, coarsely-toothed leaves and racemes of trumpet-shaped, light violet-blue flowers 7cm across, yellow in the throat

Position

Full sun

Soil Types

Loam

Max Height

4-8 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1.5-2.5 metres
Max Height
4-8 metres

Growing Conditions

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

Position

Full sun
Aspect
South–facing or East–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)
H1B

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
Correct
Plant Range
N India

How to Grow

Cultivation

Grow under glass in a peat-free, loam-based potting compost in bright filtered light with shade from hot sun. When in growth water moderately and apply a general liquid fertiliser monthly. Water sparingly at other times

Propagation

Propagate by seed or softwood cuttings

Suggested planting locations and garden types

  • Patio and container plants

Pruning

Pruning group 11

Pests

May be susceptible to glasshouse whitefly, glasshouse red spider mite, aphids and scale insects when grown under glass

Diseases

Generally disease-free