Allamanda cathartica

RHS Plant Profile

golden trumpet

RHS 2002

Conservatory Greenhouse

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A vigorously climbing evergreen shrub with simple, whorled leaves and trumpet-shaped bright yellow flowers 12cm in length, borne in axillary or terminal cymes in summer and autumn

Position

Full sun

Soil Types

Loam, Sand

Max Height

8-12 metres

Max Spread

2.5-4 metres

Size

Time to Maturity: 10–20 years
Max Spread: 2.5-4 metres
Max Height: 8-12 metres

Growing Conditions

Loam Sand

Moisture: Moist but well–drained
pH: Acid or Neutral

Position

Full sun

Aspect: South–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: Apocynaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Climbing
Potentially harmful: Harmful if eatenskin and eye irritant. Wear gloves and other protective equipment when handling Pets (dogs, cats): Harmful if eatenskin and eye irritant - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus: Allamanda are evergreen shrubs, sometimes scrambling, with simple, often whorled leaves and terminal clusters of large trumpet-shaped flowers
Name Status: Correct

How to Grow

Cultivation

Grow outdoors in moist but fertile soil in full sun in frost-free location. Under glass grow in peat-free, loam-based potting compost in full sun

Propagation

Propagate by seed or greenwood cuttings

Suggested planting locations and garden types

Patio and container plants
Sub-tropical
Wall side borders

Pruning

Pruning group 11 or pruning group 12

Pests

May be susceptible to glasshouse red spider mite and glasshouse whitefly

Diseases

Generally disease-free