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I know I said I wouldn't create more plant lists, but here we are. When I talk about killer plants, I'm not referring to the ones like those in Top 10 Carnivorous Plants, which kill small insects and the occasional rat. These are the plants infamous for causing human fatalities. All plants have toxins as a defense mechanism against predators. As we learned from Top 10 Poisonous Foods We Love to Eat, even apple seeds contain a trace of cyanide.
In this list, we’re focusing on plants with toxins so potent that they can cause death within hours if exposed to humans. In many cases, animals are much more tolerant of these poisons than humans, which is why these plants are especially dangerous to people. It’s unsettling to think about how many of these plants we grew up with, unknowingly putting ourselves at risk. The bright fruits on these plants often attract children, who have an even lower tolerance to the toxins, meaning it takes far less to cause harm. This knowledge might be crucial at some point, so it's good to be aware.
10. White Snakeroot
White Snakeroot, also known as White Sanicle or Tall Boneset, is a deadly plant native to North America. Its white flowers bloom and later give way to small, fluffy seeds that are carried by the wind. This plant contains a potent toxin called tremetol, which doesn’t directly kill humans, but rather causes death indirectly. When cattle graze on the plant, they absorb the toxin into their milk and meat. Humans who then consume this contaminated beef or milk ingest the toxin, which causes a deadly condition called milk sickness. In the early 1800s, thousands of European settlers unknowingly fell victim to milk sickness in America. It is also believed that Abraham Lincoln’s mother, Nancy Hanks, died as a result of this illness.
9. Doll’s Eyes
Doll’s Eye, also called White Baneberry, is a flowering plant native to eastern and northern North America. The name 'Doll’s Eyes' comes from its unique fruit, small white berries about 1 cm (0.39 inches) in diameter, each with a black stigma scar resembling an eye. While the entire plant is toxic to humans, the most dangerous part is the fruit, which contains a potent carcinogenic toxin. The berries' sweet taste makes them even more dangerous, especially since they’ve tragically led to the deaths of several children. The toxin quickly affects the heart muscles, causing an almost immediate sedative effect that can result in rapid death.
8. Oleander
Oleander (Nerium oleander) is one of the most adaptable shrubs, with numerous applications in southern and coastal landscapes. It can withstand a variety of challenging conditions, such as poor soil, salt spray, high pH, heavy pruning, heat reflected from walls and pavements, and drought. In warmer states like California, oleander is commonly used as a median divider on freeways. There are many varieties of this plant, some of which can grow up to 18 feet in height. The flowers come in various colors, ranging from pure white to pale yellow, peach, salmon, pink, and deep burgundy red. However, despite its widespread use, oleander is extremely toxic. Even a single leaf can be fatal to an adult. All parts of the shrub—its flowers, leaves, and stems—are poisonous. Oleander contains several harmful toxins, such as digitoxigenin, neriin, and oleandrin, which can affect different systems of the body. Consuming any part of the plant can cause symptoms such as irregular or slow heartbeat, blurred vision, diarrhea, stomach pain, headaches, loss of consciousness, and even death.
7. Strychnine Tree
The Strychnine tree, also known as Poison Nut or Quaker Button, is a medium-sized tree native to India and Southeast Asia. The tree’s green to orange fruit contains small seeds that are highly toxic, packed with the dangerous alkaloids Strychnine and Brucine. As little as 30 mg of these toxins can prove fatal to an adult, leading to a painful death characterized by violent convulsions caused by the simultaneous stimulation of sensory ganglia in the spine.
6. English Yew
The English Yew is a tree native to Europe, Northern Africa, and southwestern Asia. It is a small to medium-sized tree that produces seeds enclosed in a soft, red, berry-like coating. The berry coating is the only non-toxic part of the fruit, which allows birds to consume it and disperse the seeds without harm. For humans, it takes approximately 50 grams of the plant’s parts to reach a fatal dose. Symptoms of poisoning include difficulty breathing, muscle tremors, convulsions, collapse, and ultimately cardiac arrest. In cases of severe poisoning, death can occur so quickly that the initial symptoms are often missed.
5. Water Hemlock
Water Hemlock, also known as Poison Parsnip, refers to a group of extremely toxic plants native to the temperate zones of the northern hemisphere. These plants are characterized by their small white or green flowers, which grow in an umbrella-like shape. Water Hemlock is regarded as the most poisonous plant in North America due to its extreme toxicity to humans. It contains a deadly toxin called cicutoxin, which induces seizures. This toxin is present throughout the plant but is most concentrated in the roots, especially in the spring. In addition to immediate seizures, poisoning also causes nausea, vomiting, abdominal pain, tremors, and confusion. Death typically results from respiratory failure or ventricular fibrillation and can occur within just a few hours of ingestion.
4. Wolfsbane
Wolfsbane, also known as Leopard’s Bane, Woman’s Bane, or Devil’s Helmet, is a toxic plant from the buttercup family. These perennial plants are native to the mountainous regions of the northern hemisphere. The plant contains large amounts of a potent poison called alkaloid pseudaconitine, which was historically used by the Ainu people of Japan to poison the tips of their arrows for hunting. When ingested, symptoms such as a burning sensation in the limbs and abdomen begin immediately. Ingesting a large dose can result in death within 2-6 hours, with just 20ml being enough to kill an adult human.
Interestingly, Wolfsbane also appears in mythology and werewolf legends, where it is believed to have the ability to either repel werewolves/lycanthropes or even induce the transformation into a wolf, regardless of the moon phase. This is where the name originates from.
3. Castor Plants
Thinking back to the time when your mother forced Castor oil down your throat, it’s likely you never imagined it came from the most poisonous plant on Earth (even though the taste may have hinted at that).
Castor plants are native to the Mediterranean basin, eastern Africa, and India, but are commonly cultivated as ornamental plants worldwide. The plant contains a deadly toxin called ricin, which is present throughout the plant but most concentrated in its seeds/beans, which are used to produce castor oil. Just one raw seed is sufficient to kill a human in about 2 days, leading to a painful and inevitable death. The initial symptoms begin within a few hours and include a burning sensation in the throat and mouth, abdominal pain, bloody diarrhea, and vomiting. Ultimately, death is caused by dehydration.
Interestingly, humans are the most vulnerable to the poison in these seeds. It takes just 1-4 seeds to kill an adult human, 11 seeds to kill a dog, and a staggering 80 seeds to kill a duck. The castor plant currently holds the Guinness World Record as the most poisonous plant.
2. Belladonna
Belladonna, commonly called Devil’s Berries, Death Cherries, or Deadly Nightshade, is a highly toxic plant native to Europe, North Africa, and western Asia. It’s one of the deadliest plants in the world, containing Tropane alkaloids that induce delirium and hallucinations. Poisoning from Belladonna leads to a range of symptoms such as dry mouth, loss of voice, headaches, difficulty breathing, and seizures. While the entire plant is toxic, the berries are especially dangerous due to their sweet taste, which often attracts children. Just 10-20 berries are enough to kill an adult, but a single leaf, which contains a far higher concentration of toxins, can be fatal to a grown man.
Interestingly, during the Elizabethan era (the 1500s), people of that time, despite their limited knowledge, incorporated Belladonna into their daily beauty regimen. Women used drops made from the plant as eye drops to dilate their pupils, a trend thought to enhance their allure by giving them a dreamy, hypnotic gaze. At the same time, they would also resort to drinking cyanide or self-inflicting bloodletting in an attempt to achieve pale, translucent skin. To complete the look, their faces were painted white with cerise, a lead-based cosmetic.
1. Rosary Pea
The Rosary Pea, also referred to as Crab’s Eye or Jumbie Bead, is a slender, perennial vine that wraps around trees, bushes, and fences. Originally native to Indonesia, it can now be found in various regions worldwide. Its seeds, which are used to make jewelry, are particularly striking, displaying a vivid red to orange color with a black spot, reminiscent of an inverted black widow spider. The plant contains a potent toxin called abrin, which is strikingly similar to ricin but is about 75 times more deadly. This means the lethal dose is much smaller, with just 3 micrograms being enough to kill an adult human. Even using the seeds for bead-making is risky; some have died merely from pricking their fingers on the drill bits used to create holes in the seeds.
