Buzz
Flowers are nature’s ingenious method of deceiving insects into assisting plants with reproduction, and in return, humans get to cultivate something lovely in their gardens. Out of around 350,000 species of flowering plants, most are harmless, but a few are ruthless killers with no mercy.
10. Kalmia Latifolia
Kalmia latifolia, also known as mountain laurel, boasts delicate pink and white flowers during late spring. It’s the state flower of both Pennsylvania and Connecticut and can be found throughout the eastern United States. Its beauty masks the deadly nature it hides beneath.
The primary toxins in Kalmia latifolia are andromedotoxin and arbutin, but andromedotoxin is the real threat. It causes part of the heart to beat rapidly while another part beats dangerously slow. In healthy individuals, the heart has a natural block to half of the electrical pulses, but this toxin induces Wolff-Parkinson-White (WPW) syndrome, which removes that block, allowing all pulses to reach the heart. The end result? Sudden cardiac death.
However, this severe effect only occurs with a large amount of the toxin. With smaller amounts, expect intense vomiting followed by fluids leaking from every orifice. About an hour later, your breathing will slow, muscle control will be lost, and you’ll slip into a coma before ultimately dying.
What’s even more terrifying is that you don’t need to eat the flowers themselves—honey produced by bees who have visited Kalmia latifolia carries all of the flower’s toxic properties. The Greeks called it “mad honey,” using it in 400 B.C. to defeat Xenophon of Athens.
9. Jacobaea Vulgaris
Ragwort, a common wildflower in the UK, plays a vital role in the local ecosystem. Around 80 different insect species rely on it for food, with at least 30 depending solely on ragwort. This makes the plant particularly significant for conservation groups. While this is positive for insects, it poses a problem for other organisms. The World Health Organization has identified at least eight harmful alkaloids in ragwort, with potentially 10 more lurking.
The issue lies in the fact that, unlike many poisons that leave the body quickly, the alkaloids in ragwort accumulate in the liver over time. This build-up leads to liver cirrhosis, a condition where the liver slowly collapses as healthy cells degrade into scar tissue that no longer functions. Though the liver can continue working normally until up to 75% of it’s been destroyed, the damage becomes irreversible by the time symptoms emerge.
Symptoms of ragwort poisoning include lack of coordination, vision loss, sharp stomach pains, and yellowing of the eyes due to bile pigment coating the eye's surface. Sadly, this toxin also contaminates honey, and can be found in milk from goats who consume ragwort. As an added burden, when farmers attempt to eliminate ragwort from their fields, the toxins can penetrate the skin on their hands.
8. Veratrum
Found on nearly every mountain in the Northern Hemisphere, species of Veratrum produce stunning spiral clusters of white, heart-shaped blooms. Often cultivated for ornamental purposes, the plant is admired for its attractive leaves, and in the wild, it’s frequently mistaken for garlic. However, regardless of its beauty, every part of this plant, from the roots to the pistils, is extremely toxic.
The initial sign of Veratrum poisoning is intense stomach cramping, typically beginning around 30 minutes after ingestion. As the toxins are absorbed into the bloodstream, they specifically target sodium ion channels. These channels act as gateways, allowing sodium to pass through nerves, which triggers bodily actions. For instance, in muscle cells, the opening of sodium ion channels sets off the muscle contraction process.
When the toxins from Veratrum reach the sodium ion channels, they overwhelm the system, causing them to open uncontrollably. This forces the channels to fire continuously, confusing the body’s normal functions. As a result, the heart starts to alternately slow down and speed up, while muscles across the body go into spasms. Ultimately, the poison either leads to a heart attack or a coma. It is believed that this is the poison that killed Alexander the Great.
7. Zantedeschia
The stunning perennial Zantedeschia has been introduced to every continent except Antarctica and is commonly found in ornamental gardens. Though often referred to as a calla lily, it’s not related to lilies at all and doesn’t resemble one. The flowers, which are tube-shaped, come in a variety of vibrant colors.
Zantedeschia species contain calcium oxalate, a compound that forms sharp, needle-like crystals inside the body’s organs. Over 1,000 plant species contain calcium oxalate, but Zantedeschia is among the most dangerous due to its widespread nature. Even a small exposure to the chemical can cause the throat to swell, often accompanied by a painful burning sensation.
The more you consume, the more severe the symptoms become, eventually causing your throat to swell so much that it blocks your airways. In one case, a Chinese restaurant accidentally added petals from a toxic flower to their dishes, resulting in everyone who ate it being rushed to the hospital.
6. Colchicum Autumnale
Colchicum autumnale is native to the UK, but it is now found throughout most of Europe and New Zealand. Commonly known as the “naked lady,” this name is misleading, as it refers to a deadly plant. The only known remedy for Colchicum poisoning is a slow and agonizing death.
The chemical responsible here is colchicine, a toxin that kills in a manner similar to arsenic, gradually shutting down the body's essential systems. Symptoms of Colchicum poisoning include mass organ failure, blood clots, and nerve damage, just to name a few. Every few days, a new wave of symptoms arises as yet another organ system collapses.
Death can take anywhere from a few days to several weeks, but when you ingest enough, it’s always fatal. Strangely, the flower keeps you conscious until the very end, making you endure each agonizing moment. Many have likened the death from Colchicum to that of cholera.
5. Laburnum
Everyone’s brain is naturally programmed to accept nicotine through receptors that match the shape of nicotine molecules. Despite their name, nicotinic receptors can also interact with other substances. One such substance is cytisine.
In small amounts, cytisine isn’t particularly harmful. As a medication, it’s sometimes used to help people quit smoking due to its ability to bind to nicotinic receptors. However, in larger quantities, it becomes highly toxic.
Laburnum poisoning has been documented for centuries, often involving children who ingest the flowers or the seed pods, which resemble pea pods. The cytisine present in all parts of the tree takes effect within minutes. Poisoning begins with severe vomiting, followed by frothy foam pouring from the mouth. After about an hour, convulsions begin.
Typically, convulsions occur in waves, like the ebb and flow of ocean tides. But with cytisine poisoning, the convulsions are so closely spaced that the muscles remain locked in a permanent contraction, a condition known as tetanic contraction. This leads to a deep coma and eventual death. Thankfully, with timely medical intervention, Laburnum poisoning is rarely fatal these days.
4. Cerbera Odollam
Cerbera odollam, commonly known as the "suicide tree" in India, lives up to its name. A study conducted by researchers uncovered its gruesome potential as a tool for murder. Between 2000 and 2010, it was linked to at least 500 deaths in the southwest of India. The plant’s toxic chemical, cerberin, is powerful enough to silently kill its victims, making it a feared choice for those with malicious intent.
Cerberin acts swiftly, with effects starting within an hour. Victims experience mild stomach discomfort before descending into a coma. Their heart stops after a few hours. Since the poison is undetectable afterward, it’s often chosen as a discreet murder weapon. Experts believe that many other deaths from Cerbera odollam went undetected, where foul play was never suspected.
3. Oenanthe Crocata
In 2002, eight tourists in Argyll, Scotland foraged what they believed to be water parsnips from a nearby stream. They took the plant home and added it to a curry dish. The following day, four of them found themselves hospitalized. The plants they gathered were actually Oenanthe crocata, or hemlock water dropwort, a deadly species with a 70 percent mortality rate. Fortunately, no one lost their life.
Hemlock water dropwort has a peculiar characteristic: the lethal toxin, oenanthotoxin, causes the muscles around your lips to contract, forcing an unnatural smile even as you experience fatal convulsions. The plant has been recognized in Greek culture since at least the eighth century B.C., with Homer coining the term “sardonic grin” to describe the haunting smile of those poisoned by water dropwort.
2. Adenium Obesum
Native to Africa, Adenium obesum, also known as the desert rose, has long been used by tribes as a poison for their spears. The process of preparing this toxic concoction involves boiling the plant for 12 hours, then removing the plant material and letting the remaining liquid evaporate. The result is a highly concentrated poison so potent that a single drop on a spear or arrow is enough to take down large prey, often before it can even travel 2 kilometers (1.2 miles).
The poison extracted from Adenium obesum has been used to hunt animals as large as elephants, and now that we’ve studied it, we know that the plant contains a chemical called ouabain. This toxin causes respiratory failure almost instantly when administered in high doses.
Another flower from the Apocynaceae family grows in the same region and is often used alongside Adenium by hunters. This plant also contains ouabain, and interestingly, it’s not just humans who utilize this deadly power—the African crested rat chews on the plant's bark and licks its fur with the toxic substance, turning itself into a walking danger zone.
1. Sanguinaria Canadensis
Known commonly as bloodroot, Sanguinaria canadensis is a plant native to eastern North America. Native American tribes utilized the plant's red roots not only for dyeing but also to induce abortions. Consuming enough of the root could even lead to a coma.
In more recent times, people have turned to bloodroot as a home remedy for skin cancer, but the results have been disastrous. Bloodroot contains a toxin called sanguarine, which, in addition to being poisonous, is an escharotic. Escharotics kill tissue and cause it to fall off in the form of a creamy pulp, leaving behind a blackened scar known as an eschar. Essentially, applying bloodroot to your skin forces your cells to kill themselves.
Internally, the same process occurs. The chemical interferes with an enzyme called Na+/K+-ATPase, which is responsible for the vital task of pumping sodium out of cells while bringing potassium in. When this process is disrupted, all functions break down.
