Aristolochia gigantea

RHS Plant Profile

giant Dutchman's pipe

RHS

Synonyms

Aristolochia clypetala

Climber Wall Shrub Conservatory Greenhouse

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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

Position

Full sun, Partial shade

Soil Types

Loam

Max Height

8-12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity: 5–10 years
Max Spread: wider than 8 metres
Max Height: 8-12 metres

Growing Conditions

Loam

Moisture: Moist but well–drained
pH: Neutral

Position

Full sun Partial shade

Aspect: North–facing or West–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: Aristolochiaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Climbing
Potentially harmful: TOXIC if eaten. Wear gloves and other protective equipment when handling Pets (dogs): TOXIC if eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
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
Name Status: Correct
Plant Range: Brazil

How to Grow

Cultivation

Under glass grow in peat-free 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

Pruning

Pruning group 11

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus in gardens where it is present but insufficient data to determine degree of susceptibility