Golden Trumpet (Allamanda cathartica) Growing & Care Guide for Gardeners
Article by Dean Ravenscroft, Ph.D. - Updated 31st Jan 2024
- Plant Characteristics: Allamanda cathartica is celebrated for its vibrant, trumpet-shaped yellow flowers and glossy green leaves. A fast-growing tropical vine, it's ideal for adding a splash of color to trellises, fences, and arbors.
- Growing & Care: Thrives in full sun and requires well-drained, fertile soil. It's a heavy feeder and benefits from regular fertilization during the growing season. Adequate watering is key, but avoid waterlogging the soil.
- Tips for New Gardeners: Suitable for beginners in warm climates. Support structures are necessary for its climbing habit. Be mindful of its toxicity if ingested and wear gloves while pruning, as the sap can be irritating to the skin.
Allamanda cathartica is a woody evergreen, tropical bush vine. It is often called by its common moniker, Golden Trumpet.
This vine plant boasts deep yellow trumpet flowers spanning 5 inches (12 cm).
Allamanda cathartica flower trumpets image by Forest and Kim Starr; CC.
Golden Trumpet blooms consistently through the summer and into the first frost of fall in typical conditions; but can bloom all year in a tropical environment.
The foliage appears as bright green, leathery leaves that grow up to 4 - 6 inches long (10 to 15 cm).
Allamanda cathartica (Yellow allamanda) photograph by Forest and Kim Starr.
Allamanda cathartica can be trained to grow onto a trellis as a vine or pruned into a bush shape.
This woody climber can grow up to 10 - 20 feet tall (3 to 6 m) and 3 - 6 feet (0.9 to 1.8 m) wide. It is able to grow faster in warmer weather.
Gardener's HQ Allamanda cathartica Growing Guide
Grown best in hardiness zones 10 to 11, the Allamanda cathartica plant requires warm temperatures to grow and bloom properly.
It prefers full sunlight exposure but will tolerate partial shade.
Best grown in loamy or sandy soils, Golden Trumpet requires a cooler temperature for its roots than its vines. It does well in fertilized, moist soils.
Golden Trumpet plant, photograph by Forest and Kim Starr; CC.
For optimal growth, this woody vine should be fertilized and watered regularly during its growing season.
Organic mulch is recommended for application around the base of the plant to keep the soil moist and at a lower temperature.
The vines only produce blooms on new growth, and pruning is recommended for the most cohesive look.
Allamanda cathartica may be cut back in early spring to ripe or half-ripe wood in order to stimulate more growth during the growing season.
Allamanda cathartica, image by Forest and Kim Starr; CC.
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Allamanda cathartica Growing and Care Guide
- Scientific Name: Allamanda cathartica.
- Common Name: Golden Trumpet.
- Growing Zone: USA: 9 to 11; UK H1b, Grow indoors, should be fine outdoors in a container in the summer.
- Life Cycle / Plant Type: Vine, Shrub.
Plant Details
- Plant Height (Inches): 300 to 600.
- Plant Spread (Inches): 80 to 144.
- Time of Bloom: Mid summer to Mid fall.
- Flower Details: Yellow.
- Leaf Foliage: Green.
- Fruit:
- Growth Form: Spreading or horizontal, Upright or erect, Variable spread.
Ideal Growing Conditions
- Best Light Conditions: Full sunlight.
- Rate of Growth: Quick.
- Suitable Soil Types: Adaptable, Clay, Loamy, Sandy, Well drained.
- Soil Moisture: Moist.
Caring Conditions
- Care: Regular watering when in growth period. Reduce this while the plant is dormant in the winter. Regular pruning to confine plant and keep it tidy.
- Level of Maintenance: medium.
- Propagation: Seed or green wood cuttings.
- How to Prune: As a vigorous climber it is important to prune back flowers that occur on last years growth following flowering, while flowers on this years growth should be pruned towards the end of winter or in spring. Other than this no need to perform pruning except to keep plants tidy and confined.
- Pests: Glasshouse Red spider mite and Whitefly.
- Diseases: scale, leafspot.
Further Information
- Can Attract: Pollinators, especially bees and butterflies.
- Tolerant of: Heat, high humidity.
- Best Garden Use: Arbor, Container, Specimen.
- Family: Apocynaceae.
- Closely Related Species: Dogbanes: Adenium, Amsonia, Asclepias, Nerium, Pachypodium, Wrightia, Vinca.
I hope that you enjoyed this guide on how to grow Allamanda cathartica. You may also enjoy the following Gardener's HQ growing guides: How to grow Catharanthus and Vinca minor plants.
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