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Updated by Erika Foulk on Apr 02, 2018
Headline for 10 Most Poisonous Plants in the World
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Erika Foulk Erika Foulk
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10 Most Poisonous Plants in the World

Even some commonly planted garden plants can be poisonous. Read this list to find out which plants you and those around you need to stay away from.

10

Oleander

Oleander

The Oleander is a native plant to Asia and is now spreading throughout the Mediterranean and North America. This toxic plant is a common outdoor shrub with pretty, delicate flowers. The entire plant contains glycosides which can immediately cause cardiac arrest. Ingestion can cause bloody stools, vomiting and irregular heartbeat.

9

English Yew

English Yew

The English Yew is a native tree to Europe, North Africa and Southwest Asia. This toxic tree contains poisonous seeds in it's bright red berries. Ingestion can cause convulsions and muscle tremors which can lead to cardiac arrest. It only takes around 50 grams to kill humans.

8

Hemlock

Hemlock

The Hemlock originated in ancient Greece. This is a toxic flowering plant that was once used to execute people-one of the victims being Socrates- because of how poisonous it was. This plant contains the substance called Coniine which can cause paralysis to respiratory muscles leading to death within minutes of ingestion.

7

White Snakeroot

White Snakeroot

The White Snakeroot grows extensively in North America. This flowering plant contains the substance tremetol which can cause vomiting, thirst, delirium and death. This plant can be used to cure snake bites, but will cause immediate death if ingested by humans.

6

White Baneberry

White Baneberry

This flowering plant is native to Eastern America. This is an entirely poisonous plant that will cause immediate death upon ingestion. Consumption will sedate cardiac muscles immediately.

5

Aconite

Aconite

This is a poisonous flower plant that was once used to tip arrows for hunting in Ancient Greece. It is now native to Europe. It can be used to treat anxiety, fear and restlessness. However, a slight touch to the flower can have severe symptoms and ingestion of the plant is fatal.

4

Strychnine Tree

Strychnine Tree

This tree is native to India and the tropics of Southeast Asia. This tree is also known as the Suicide Tree. It has poisonous seeds inside the fruit that can cause a painful death for humans. It contains alkaloids that can disrupt the heart's rhythm within hours of consumption. It can also cause convulsions and stimulation of sensory ganglia in the spine.

3

Manchineel Tree

Manchineel Tree

This toxic tree can be found around the coast of Florida. Any contact with this toxic tree's milk sap can immediately cause blisters on the skin and ingestion can be fatal. This tree is considered the most poisonous tree in the southeastern part of the U.S.

2

Rosary Pea

Rosary Pea

This plant is native to Indonesia. The plant's bright red seeds contain a substance called abrin that can inhibit cellular activities in the body, which can make it difficult for humans to perform molecular functions, such as synthesizing proteins. A single seed is fatal to humans.

1

Castor Oil Plant

Castor Oil Plant

The Castor Oil plant is native to the Mediterranean, Eastern Africa, and India. This toxic plant contains seeds that have a substance called ricin which can be used as a laxative, but if consumed directly, it only takes four seeds to be deadly to humans.