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Conservatory GreenhouseClimber Wall Shrub

Allamanda cathartica 'Hendersonii'

golden trumpet 'Hendersonii'

A strong-growing, tropical, evergreen climber with whorls of 3-4 glossy lance-shaped leaves. In summer and autumn it bears golden yellow flowers to 13cm across that open from bronze-tinted buds. Grow in a large pot in a conservatory

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Ultimate height

4–8 metres

Time to ultimate height

5–10 years

Ultimate spread

4–8 metres

Loam

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

East–facing or South–facing or West–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: Accepted

How to grow

Cultivation

Under glass, grow in peat-free, loam-based compost in full light. Water freely in growth, applying a balanced liquid fertiliser every 2-3 weeks. Water sparingly in winter. Provide support for the climbing stems

Propagation

Propagate by seed sown at 18°C in spring, or by softwood cuttings

Suggested planting locations and garden types

Sub-tropical
Climber and wall shrubs
Conservatory and greenhouse

Pruning

Pruning group 11 or 12 in late winter or early spring

Pests

May be susceptible to glasshouse red spider mite and glasshouse whitefly

Diseases

Generally disease-free

Get involved

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