• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Aristolochia gigantea

giant Dutchman's pipe

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
giant Dutchman's pipe

© RHS

  • Other common names giant Dutchman's pipe

  • Synonyms Aristolochia clypetala

  • Family Aristolochiaceae

  • Genus Aristolochia can be shrubs or herbaceous perennials, many climbing, usually with heart-shaped or ovate leaves. Distinctive flowers have an S-shaped calyx tube and no petals, and are may be white, yellow, brown or maroon, often mottled

  • Details A. gigantica is a vigorous, evergreen twining climber with heart-shaped leaves 5-10cm long. The flowers are up to 30 cm deep, a dark, reddish-purple with intricate cream mottling, and an unpleasant smell

  • Plant range Brazil

Characteristics

  • Foliage Evergreen

  • Habit Climbing

  • 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

Sunlight

  • Partial Shade

  • Full Sun

  • Aspect West-facing or East-facing or North-facing

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilLoam

  • pHNeutral

Size

  • Ultimate height 8-12 metres

  • Ultimate spread wider than 8 metres

  • Time to ultimate height 5-10 years

How to grow

Cultivation Under glass grow in loamless potting compost in bright filtered light. During the growing season water freely and apply a balanced liquid fertiliser monthly; water more sparingly in winter. Requires strong support

Propagation Root softwood cuttings in early spring. Propagate by seed at 21-24°C (70-75°F) as soon as ripe or in spring

Suggested planting locations and garden types Sub-tropical

How to care

Pruning Pruning group 11

Pests Generally trouble free

Diseases Generally trouble free

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