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Conservatory Greenhouse

Allamanda cathartica

golden trumpet

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

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Ultimate height

8–12 metres

Time to ultimate height

10–20 years

Ultimate spread

2.5–4 metres

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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

Botanical details

Family: Apocynaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Climbing
Potentially harmful: Harmful if eaten, skin and eye irritant. Wear gloves and other protective equipment when handling Pets (dogs, cats): Harmful if eaten, skin 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

Get involved

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