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Photo: Billjones94 / CC BY-SA 4.0 / Wikimedia Commons
ClimberExotic

Allamanda

Allamanda cathartica

A fast, glossy-leaved scrambler hung with golden trumpet flowers through the warm months. It needs tying in, steady water, gloves for pruning and care around its irritant sap.

Mature size2–6 m tall, 1.5–3 m spreadGrowthFastSunFull sunWaterModerate
Heat: 4 of 5
Salt: 2 of 5
Drought: 3 of 5
Shade: 2 of 5
Ease of care: 4 of 5
Use in a designGet it looked after

Season

Through the Dubai year

How Allamanda behaves through Dubai's seasons, month by month.

J
F
M
A
M
J
J
A
S
O
N
D
24°
26°
29°
34°
38°
40°
42°
42°
40°
36°
31°
27°

Best planting window

Spring growth flush after pruning

Golden trumpet season

Apr – Nov

Hard prune and tie in

Feed in the growing season

Mar – Jun

  • Best planting window: Mar–Apr, Oct–Nov

    Moderate temperatures help roots establish before summer.

  • Spring growth flush after pruning: Mar–Apr

  • Golden trumpet season: Apr–Nov

    NC State records summer to autumn flowering; in Dubai expect the warm months, with a lull in winter.

  • Hard prune and tie in: Jan–Feb

    Cut back hard before the spring flush, wearing gloves because of the irritant sap.

  • Feed in the growing season: Mar–Jun

    A balanced slow-release feed every couple of months supports flowering.

Allamanda is evergreen and flowers through the warm months, which NC State records as summer to autumn; in Dubai expect trumpets from spring through autumn with a lull in the coolest weeks of winter. New growth flushes from March. Prune hard in late winter, before the flush, to keep it dense and floriferous, and tie in the long shoots as they grow. In peak summer, give it deep, regular watering and watch for leaf scorch in reflected heat. Plant in March and April or October and November.

Meet the plant

Meet the Allamanda

Meet allamanda, the plant that makes a wall look as if it has been hung with golden trumpets. Each flower is a wide, funnel-shaped cup the colour of buttercups, set against leaves so glossy that they seem freshly polished, and a well-grown plant carries dozens of them at once.

The technicality is its habit. It is neither a true shrub nor a true vine: it scrambles, throwing long, flexible shoots that lean on whatever is nearby but never twine or cling. That is why it needs tying in, and why it can be shaped into a hedge, a screen or a tidy specimen just as easily as a climber.

The mood is bright, warm and unashamedly tropical. It suits the sunny edge of a pool and a fence in full light, and it asks for water and a sharp pair of secateurs. Its milky sap is the one thing to respect, so work in gloves.

Allamanda is the plant that puts gold on a wall. Allamanda cathartica is a tropical, evergreen, woody scrambler of the dogbane family, native to South America, with shiny, dark green leaves in whorls and clusters of tubular, golden-yellow trumpet flowers up to about 9 cm across, which NC State Extension records from summer to autumn. Left alone it will sprawl to around 6 metres, but it is easily kept as a pruned shrub, a screen or a trained climber on a trellis, pergola or pool fence.

The technical point is that it is not a true climber. Wikipedia notes that allamanda does not twine and has no tendrils or aerial roots, so it will not cling to a wall; it throws long, flexible shoots that must be tied in to a support. NC State adds that it needs ample moisture, good drainage and full sun, and that its growth is rapid. In Dubai that means a sunny, irrigated position with a framework to tie to, free-draining soil so the roots are never waterlogged, and a firm annual prune, so the plant stays dense and floriferous instead of becoming a tangle.

Handle it with care. The milky sap irritates skin and eyes, and NC State records low-severity poisoning if parts are eaten in quantity, with fever, swollen lips, nausea and diarrhoea possible, so wear gloves when pruning and keep it away from play areas and pet runs. The 'Compacta' cultivar suits containers. Beside Ixora, Hibiscus and Bougainvillea, allamanda gives a long, sunny, tropical season of colour.

Design

Where to use it

Trellis or pergola climberPool fence screenPruned flowering shrubContainer specimen

Give it full sun and a framework to tie into, such as a trellis, steel frame or fence with horizontal wires, because it will not cling on its own. It is at its best as a bright screen along a pool fence or boundary, or pruned into a rounded shrub or a large container. Keep it well back from play areas and pet runs because of the irritant sap, and plan on regular irrigation and a firm prune each year.

A specimen of Ixora coccinea, also known as the Jungle Flame, shot in Miami, Florida

Ixora

Ixora's compact, bright flower clusters at the base make a layered, tropical planting and share the same demand for sun and water.

Hibiscus rosa-sinensis 'Brilliant', a clean red flower

Hibiscus

Hibiscus' large blooms contrast with allamanda's golden trumpets, and both enjoy full sun and regular watering.

Bougainvillea in full bloom, magenta and orange bracts against a blue sky

Bougainvillea

Bougainvillea's colour on a neighbouring wall provides a lower-water partner for a sunny boundary, with colours that contrast well with the yellow.

Near Palm Tree House, Woodfordhill, Dominica, W.I.

Heliconia

Heliconia's bold, upright bracts echo the lush tropical mood of the golden trumpets, in a well-watered, high-colour corner.

Care guide

How to grow it in Dubai

Watering

Summer: Water deeply two or three times a week; NC State records that it needs ample moisture and good drainage.

Winter: Reduce to about weekly as growth slows.

Establishment: Water regularly for the first few months until the plant is established.

Soil
Good drainage with plenty of organic matter; NC State lists loam and high-organic soils.
Feeding
A balanced slow-release feed every couple of months through the growing season.
Pruning
Prune hard in late winter to shape and keep it dense, and tie in long shoots as they grow. Wear gloves and eye protection, as the sap irritates skin and eyes.
Planting
Plant in full sun beside a trellis or frame, in March, April, October or November.
Pests
No known diseases or insect pests (NC State Extension)

Avoid these

Common mistakes

  • Treating it as a self-clinging climber. It has no tendrils or aerial roots, so tie the shoots into a support.
  • Pruning without gloves. The sap irritates skin and eyes, so protect your hands and face.
  • Planting it by a play area or pet run. NC State records low-severity poisoning if parts are eaten.
  • Letting it dry out. It needs ample moisture and good drainage, and flowers suffer if it is stressed.
  • Leaving it unpruned. It can sprawl to around 6 m, and a hard annual prune keeps it dense and flowering.

Extra notes

Good to know

  • Wikipedia records it as native to South America, including Bolivia, Brazil, French Guiana, Guyana, Suriname and Venezuela, and now naturalised across tropical regions.
  • The species name cathartica refers to the purgative effect of the plant if eaten, according to NC State.
  • Wikipedia notes that it does not twine and has no tendrils or aerial roots, so it must be tied in.
  • The fruit is a spiny pod holding winged seeds, according to NC State.

Toxicity: Low-severity poisoning if eaten in quantity: NC State records fever, swollen lips, nausea and diarrhoea. The sap irritates skin and eyes, and contact dermatitis is possible, so wear gloves and keep it from children and pets.

Pros

  • Showy golden trumpet flowers up to about 9 cm across through the warm months
  • Glossy, dark evergreen leaves look good all year
  • Fast growing; can be trained as a climber, screen or shrub
  • Compact cultivar 'Compacta' suits containers
  • No known diseases or insect pests, according to NC State Extension

Cons

  • Sap irritates skin and eyes, and the plant is poisonous if eaten in quantity
  • Does not twine or have tendrils, so it needs tying in to a support
  • Wants ample moisture and good drainage, so it is thirstier than bougainvillea
  • Sprawls to around 6 m unpruned and needs regular cutting back

FAQ

Common questions

Is allamanda a climber or a shrub?
Both, in effect. Wikipedia notes it does not twine and has no tendrils, so it scrambles rather than climbs. Trained and tied in, it makes a climber; pruned hard, it makes a rounded shrub or a screen.
Is allamanda poisonous?
NC State records low-severity poisoning if parts are eaten in quantity, with fever, swollen lips, nausea and diarrhoea possible, and notes that the sap irritates skin and eyes. Wear gloves when pruning and keep it away from children and pets.
How much water does it need in Dubai?
More than bougainvillea. NC State records that it needs ample moisture and good drainage, so in peak summer plan on a deep watering two or three times a week, with free-draining soil so the roots are never waterlogged.
When should I prune allamanda?
In late winter, before the spring flush. Cut it back hard to keep it dense and floriferous, tie in the new shoots, and wear gloves and eye protection because of the sap.
Will it flower through a Dubai summer?
NC State records summer to autumn flowering, and in Dubai it should flower through the warm months if it is regularly watered and fed. Flowering eases in the coolest weeks of winter.

Not sure how it suits your garden?

Ask about Allamanda on WhatsApp

Sources

  1. 1. NC State Extension Gardener Plant Toolbox: Allamanda cathartica
  2. 2. Wikipedia: Allamanda cathartica (native range, habit, naturalisation)

Last reviewed 2026-10-05 by Ghaf Gardens horticulture desk.

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