Is Manchineel Tree Poisonous? – One of the Most Toxic Trees on Earth

The manchineel tree (Hippomane mancinella) is extremely toxic to humans, dogs, cats, horses, and virtually all mammals. Every part of the plant is dangerous: the fruit, sap, bark, leaves, and even the smoke from burning its wood. This is not a plant where caution is sufficient; avoidance is the only safe approach.

What Makes Manchineel So Dangerous

The manchineel is native to tropical coastal areas of the Americas, the Caribbean, and southern Florida. It can grow as a large shrub or tree, often near beaches. Its small, round, green-to-yellowish fruit resembles a crabapple and has a sweet smell that can be misleading.

The tree produces a milky white latex sap throughout all its tissues. This sap contains a complex mixture of phorbol esters (including hippomanin and mancinellin) along with other highly irritating compounds. These chemicals cause severe inflammatory and caustic reactions on contact with any tissue they touch.

Standing under the tree during rain is enough for the sap, diluted and washed off the leaves, to raise blisters on exposed skin. Burning the wood sends toxic particles and smoke into the air that can cause eye inflammation and, with prolonged exposure, temporary blindness.

Toxic Parts

All parts of the manchineel tree are toxic:

• Fruit (called “manzanilla de la muerte” or “little apple of death”): initially sweet-tasting, then causes rapidly progressive burning pain, swelling of lips, tongue, and throat, and serious damage to the digestive tract
• Sap and latex: causes severe chemical burns to skin and eyes on direct contact
• Leaves and bark: contain the same caustic compounds as the sap
• Wood smoke: toxic to the eyes and respiratory tract

Symptoms of Exposure

Dogs and cats: Contact with the sap causes immediate skin and eye irritation, blistering, and pain. Ingestion of any part causes severe burning of the mouth, throat, and gastrointestinal tract, leading to drooling, vomiting, and abdominal distress. Serious ingestion can cause hemorrhage and organ damage.

Humans and children: Skin contact with sap produces blistering within minutes to hours. Eye contact can cause severe pain, corneal damage, and temporary vision loss. Eating the fruit, even a small amount, causes intense burning in the mouth and throat, severe swelling, vomiting, and gastrointestinal hemorrhage. Symptoms can be delayed or worsen over hours. Deaths from eating the fruit have been documented.

What to Do After Exposure

1. Move away from the tree immediately if you are near one.
2. If sap contacts skin, flush with large amounts of clean water for at least 15 to 20 minutes.
3. If sap contacts the eyes, flush with clean water immediately and seek emergency medical care.
4. If any part of the tree was ingested, do not induce vomiting.
5. Call poison control at 1-800-222-1222 (US) or your vet immediately. Do not wait for symptoms to develop.
6. Seek emergency care. Manchineel poisoning is a medical emergency.

Do not try to treat manchineel burns at home. This plant causes real chemical burns that require medical evaluation.

Handling and Avoidance

If you live in or visit an area where manchineel trees grow, the safest rule is not to touch or eat anything from the tree, not to stand beneath it during rain, and not to shelter under it for any reason.

The tree is sometimes marked with warning signs in parks and nature reserves in Florida, the Caribbean, and Central America, but not always. The fruit lying on the ground under the tree is particularly hazardous because it looks harmless.

If you are burning fallen wood, never burn manchineel. Identify the wood correctly before any bonfire or fire pit use in tropical coastal areas.

Pets and children are at highest risk because they may be attracted to the fruit’s apple-like appearance and smell.

Frequently Asked Questions

Is the manchineel really one of the most toxic trees in the world? Yes. It has been cited as the world’s most dangerous tree and holds that reputation among toxicologists. Every part is toxic, and even indirect exposure through rain or smoke causes injury.

What does manchineel sap do to skin? It causes a contact dermatitis with blistering that resembles a chemical burn. The blisters can be severe and take days to heal.

Is the fruit deadly to eat? Eating the fruit can be life-threatening. Even a small amount causes severe burning and swelling. There are documented fatalities. This fruit should never be eaten.

Can dogs get poisoned by sniffing around a manchineel tree? Direct contact with sap or ingesting fallen fruit is the primary concern. If your dog has been near a manchineel tree and shows any signs of oral or skin irritation, contact a vet immediately.

Where does manchineel grow? It is native to Florida, the Caribbean, Central America, and northern South America. It often grows near beaches and coastlines.