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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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Size
Ultimate height
8–12 metres
Time to ultimate height
10–20 years
Ultimate spread
2.5–4 metres
Growing conditions
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Yellow Green
Autumn Yellow Green
Winter Green
Position
  • Full sun
Aspect

South–facing or West–facing or East–facing

Exposure
Sheltered
Hardiness
H1B
Botanical details
Family
Apocynaceae
Native to the UK
No
Foliage
Evergreen
Habit
Climbing
Potentially harmful
Ingestion may cause severe discomfort, skin and eye irritant. Wear gloves and other protective equipment when handling
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 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

Can get glasshouse red spider mite and glasshouse whitefly

Diseases

Generally disease free

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