Allamanda cathartica ‘Double Yellow’ (Double Yellow Allamanda)

Allamanda ‘Double Yellow’ is a vigorous tropical flowering plant valued for its large, double golden-yellow blooms and lush evergreen foliage. It is widely used on trellises, fences, and in tropical gardens where bold colour and fast coverage are desired.

The plant produces glossy green leaves along twining or sprawling stems. Large, double-petalled flowers in rich golden-yellow tones appear through the warmer months, creating a bright, tropical display.

Key Features

‘Double Yellow’ is known for its showy double flowers and extended flowering season.

Its vigorous growth makes it ideal for covering structures quickly.

The lush foliage and vivid blooms create a strong tropical effect.

Growth Habit and Size

This variety grows as a climbing or sprawling shrub.

It typically reaches 3 to 6 metres in length when supported, though it can be maintained smaller with pruning. Growth rate is fast.

Care Requirements

Light

Requires full sun for best flowering and vigorous growth.

Watering

Requires regular watering during establishment and active growth.

Keep soil moderately moist but well-drained.

Soil

Prefers fertile, well-draining soil enriched with organic matter.

Temperature and Climate

Suitable for tropical to subtropical climates. Thrives in warmth and humidity but is sensitive to frost.

Maintenance

Moderate maintenance. Prune regularly to control size and encourage bushier growth and flowering.

Provide support such as a trellis or fence if climbing growth is desired.

Fertilise during the growing season to support flowering.

Common Issues

Sensitive to frost and cold temperatures.

Poor drainage may lead to root problems.

Pests such as aphids or spider mites may occasionally occur.

Milky sap may irritate skin.

Applications

Allamanda ‘Double Yellow’ is suitable for:

Trellises and fences
Tropical gardens
Feature flowering displays
Pergolas and screening
Large containers in warm climates

Its large flowers create a dramatic tropical feature.

Specification and Care Chart

FAQ – Allamanda ‘Double Yellow’

What colour are the flowers?
Bright golden-yellow.

Are the flowers double?
Yes, the blooms have multiple layers of petals.

Does it need support?
Yes, if grown as a climber.

Does it need full sun?
Yes, full sun is essential for best flowering.

Is it frost tolerant?
No, it is highly sensitive to frost.

How big does it grow?
Typically reaches 3 to 6 metres with support.