Top 10 Most Dangerous Plants in the World

• plants
• gardening
• poisons

Discovered more than 5000 feet above sea level on Mount Victoria in the Philippines, the giant, carnivorous pitcher plant secretes a nectar-like substance to lure unsuspecting prey into a pool of enzymes and acid. A series of sticky, downward ribs makes it nearly impossible for trapped prey to escape.  The plant's 30-centimeter diameter is large enough to trap unlucky rodents, but insects are its most common meal. Pitcher plants, of which there are about 600 different species, tend to grow in nitrogen-deficient environments, and therefore get their nutrients from decaying victims.



Castor-bean plants can be purchased at just about any garden center, despite containing the deadly poison ricin. Amy Stewart, author of Wicked Plants and poisonous plant expert, has an affinity for the plant and grows several in her poison garden. Concerned gardeners can simply pluck the seeds off the plant, Stewart says, which is where the ricin is stored. Though the process to extract enough ricin and process it into a weapon is complex, Las Vegas authorities have discovered the toxin in a hotel room in February 2008, and the KGB used it to permanently silence opposition.



Deemed the most "violently toxic plant that grows in North America" by the USDA, the water hemlock contains the toxin cicutoxin, which wreaks havoc on the central nervous system, causing grand mal seizures—which include loss of consciousness and violent muscle contractions—and eventually death, if ingested. Water hemlock is different from poison hemlock, Socrates' notorious killer, in that it contains coniine alkaloids that kill by paralyzing the respiratory system. Both are members of the carrot family.



Drinking milk from a cow that decided to chow down on white snakeroot could lead to deadly milk sickness, as was the case with Abraham Lincoln's mother Nancy Hanks. Every part of this perennial plant contains tremetol, an unsaturated alcohol that can cause muscle tremors in livestock before killing them.  "People were trying desperately throughout the 19th century to figure out what was poisoning their animals," Stewart says. It wasn't understood until the turn of the century, when the U.S. Department of Agriculture pinpointed the cause and quickly got the word out. Now, white snakeroot still grows wild, but more control in the agricultural industry has helped to prevent cows from eating it.



Stewart was once asked what the best plant would be to murder a dinner guest with—after much deliberation she landed on monkshood. "You could just chop up the roots and make a stew," she says. "You don't need a chemistry plant to do it." The vibrant purple plant, commonly found in backyard gardens, is loaded with the poisonous alkaloid aconite, which tends to cause asphyxiation. While Stewart is certainly joking about cooking up a batch of monkshood stew, she urges anyone who has the plant in their garden to wear gloves when handling it.

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