Yellow oleander (Cascabela thevetia): colours, meaning, where it grows and when it blooms

Yellow oleander is an evergreen shrub or small tree from Mexico and Central America, now grown in gardens and parks across many warm regions. It has glossy, narrow leaves and bright yellow, funnel-shaped flowers that bloom from summer to fall. All parts of the plant are poisonous, but the flowers are used in Hindu worship in India.

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All parts of yellow oleander are poisonous to most animals and people
Bright yellow, funnel-shaped flowers bloom from summer to autumn
Used in Hindu worship practices in India
Tolerates drought and high temperatures
Sometimes called 'Napoleon's hat' in Brazil

What does Yellow oleander look like?

Yellow oleander is a tropical evergreen shrub or small tree. Its leaves are long, narrow, and glossy green, shaped a bit like those of a willow. The plant produces clusters of funnel-shaped flowers, mostly bright yellow but sometimes apricot or white. Flowers bloom at the ends of branches from summer to autumn. The fruit is deep red-black, containing a large seed. All parts of the plant are poisonous.

Where does Yellow oleander come from?

Native to Mexico and Central America, yellow oleander has spread widely as a garden plant in warm climates. It is cultivated in many countries, including India, Brazil, and Sri Lanka, and has become naturalized in semi-arid regions. The name 'Cascabela' comes from Spanish words for a small bell or rattlesnake, hinting at its toxicity. The scientific name honors André de Thevet, a French explorer.

When and how Yellow oleander blooms

Yellow oleander flowers from summer into autumn. It grows well in hot, dry climates and tolerates drought and a range of soils. In places with frost, it is often grown in containers and brought indoors for winter. The plant is usually grown from seed or cuttings. Its waxy leaves help it conserve water.

How Yellow oleander is used

The bright yellow flowers are used in Hindu worship in India. The plant is grown as an ornamental shrub or small tree in gardens and parks. Its seeds and extracts have been tested for pest control uses. All parts of the plant are highly toxic, and cases of poisoning are reported in areas where it grows.

Kinds of Yellow oleander

Besides the common yellow form, flowers can sometimes be apricot or white. In Brazil, it is called 'chapéu-de-napoleão.' In Sri Lanka and South India, local names include Kaneru and Manjal arali. Some birds can eat the seeds without harm, but most animals and people are affected by the toxins.

What Yellow oleander means

Yellow oleander is used in Hindu religious practices in India. In some regions, the plant is associated with poisoning, including its use in suicides in South India and Sri Lanka. Its toxicity is compared to that of a rattlesnake in the plant's Spanish-derived name. The plant is also grown for its ornamental value.

Questions people ask about Yellow oleander

Where does yellow oleander come from?

Yellow oleander is native to Mexico and Central America. It is now widely grown in warm regions around the world, including India, Brazil, and Sri Lanka.

What does yellow oleander look like?

It is an evergreen shrub or small tree with long, narrow, glossy green leaves and clusters of funnel-shaped flowers, usually bright yellow but sometimes apricot or white. The fruit is deep red-black and contains a large seed.

Is yellow oleander poisonous?

Yes, all parts of the yellow oleander plant are highly toxic to most animals and people. The plant contains cardiac glycosides, which can cause serious health problems if ingested.

How is yellow oleander used?

Its flowers are used in Hindu worship in India. The plant is also grown as an ornamental shrub or tree in gardens and parks. Its seeds and extracts have been tested for pest control.

What does yellow oleander symbolize or mean?

In India, yellow oleander flowers are used in religious offerings by Hindu devotees. The plant's name and reputation are also linked to its strong toxicity.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Cascabela thevetia", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Phool rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes. It is not medical or foraging advice: many flowers are poisonous, and traditional uses are reported, not recommended. If something is wrong, tell us. Last refreshed 2026-10-03.

Photo credits on this page

The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.

Plumeria: Renesis, CC BY-SA 3.0, source

Common sunflower: Jon Sullivan, Public domain, source

Mandevilla: Shuvaev, CC BY 4.0, source

Pinwheel flower: SKsiddhartthan, CC BY-SA 4.0, source

Hawthorn: Nadiatalent, Public domain, source

Cactus: G. Mütrel, Leipzig ; Berlin ; Wien : F.A. Brockhaus, Public domain, source

Oleander: Unknown author, CC BY 2.5, source

Amaranth: Kurt Stüber [1], CC BY-SA 3.0, source

Yellow oleander