Ornamental Poisonous Plants 2/2

Do You Know That Some Exotic Plants and Their Fruits Are Poisonous?

Exotic plants fascinate us with their unusual appearance, vibrant colors, and sometimes even intoxicating fragrances. Many of us grow them at home as decorative plants, or we discover their fruits in supermarkets and specialty stores. However, not everyone realizes that some of these botanical rarities can be dangerous to health or even life-threatening. Poisonous substances can be found in leaves, stems, roots, seeds, or fruits of plants that, at first glance, seem completely harmless.

In this article, we'll introduce you to several exotic plants and their fruits that are toxic and explain what specific risks they pose. We'll also advise you on how to protect yourself and your loved ones from potential poisoning.

Why Are Some Exotic Plants Poisonous?

Plants have developed various defense mechanisms over the course of evolution to protect themselves from herbivores, insects, and other threats. One of the most effective strategies is the production of toxic substances – alkaloids, glycosides, saponins, and other chemical compounds. These substances can cause digestive problems, nervous system disorders, heart issues, or even death.

Many exotic plants originate from regions where they had to cope with extreme conditions and aggressive predators. Their toxicity is therefore often higher than that of plants from our latitudes. The problem is that people in Europe often don't have sufficient information about these plants and underestimate their danger.

Examples of Poisonous Exotic Plants and Their Fruits

1. Ackee (Blighia sapida)

Ackee is the national fruit of Jamaica and a key ingredient in the traditional dish "ackee and saltfish." However, if consumed at the wrong stage of ripeness, it can cause serious poisoning. Unripe or overripe fruits contain hypoglycin A, a toxin that causes so-called "Jamaican vomiting sickness."

Symptoms of poisoning:

  • severe vomiting
  • drop in blood sugar levels
  • convulsions
  • coma and potentially death

Only the yellow arils (fleshy parts around the seeds) of fully ripe fruits are safe to eat, but even these must be properly prepared. The seeds and other parts of the fruit remain toxic.

2. Manchineel (Hippomane mancinella)

The manchineel is often called the "world's most dangerous tree." It grows in the Caribbean, Central America, and northern South America. All parts of this tree – bark, leaves, sap, and fruits – are extremely toxic.

The fruits resemble small green apples and have a sweet taste, but consuming them causes:

  • severe burning in the mouth and throat
  • swelling of the tongue and airways
  • digestive problems
  • potentially death

Even touching the tree or standing under it during rain can be dangerous, as the sap causes severe skin burns.

3. Jatropha (Jatropha curcas)

Jatropha is a tropical plant grown for its oil-rich seeds, which are used for biofuel production. However, the seeds contain curcin and other toxins that cause serious poisoning.

Symptoms after consuming the seeds:

  • nausea and vomiting
  • diarrhea
  • abdominal pain
  • dehydration
  • in severe cases, death

Although jatropha is mainly grown in plantations, its seeds can sometimes be found in decorative arrangements or as exotic souvenirs.

4. Cerbera (Cerbera odollam)

Cerbera, also called the "suicide tree," grows in India and Southeast Asia. Its fruits contain cerberin, a highly toxic substance that affects the heart.

Consuming the fruit causes:

  • heart rhythm disorders
  • nausea and vomiting
  • convulsions
  • cardiac arrest

Cerbera is one of the most commonly used plants for poisoning and suicide in Asia. Its toxicity is so high that even a small amount can be fatal.

5. Strychnine Tree (Strychnos nux-vomica)

The strychnine tree grows in India and Southeast Asia. Its seeds contain strychnine, one of the most well-known poisons that affects the nervous system.

Symptoms of strychnine poisoning:

  • muscle spasms and cramps
  • breathing difficulties
  • convulsions
  • death from respiratory paralysis

Strychnine was historically used as a rodenticide, but today its use is banned in many countries due to its high toxicity.

6. Yellow Oleander (Cascabela thevetia)

Yellow oleander is a decorative shrub with yellow flowers that is popular in tropical and subtropical regions. Its fruits and seeds contain thevetin, a toxin that causes heart rhythm disorders.

Symptoms of poisoning:

  • nausea and vomiting
  • diarrhea
  • irregular heartbeat
  • cardiac arrest

Yellow oleander is often planted in gardens and parks, which increases the risk of accidental poisoning, especially in children.

How to Protect Yourself from Poisonous Plants?

The best protection is awareness and caution. Here are a few basic rules that will help you avoid problems:

  • Never consume unknown fruits or plants: If you're not sure what plant it is, don't taste it. Many poisonous plants have an attractive appearance and sweet taste.
  • Educate yourself: Before you decide to grow an exotic plant at home or try an unknown fruit, find out about its properties and potential risks.
  • Keep plants out of reach of children and pets: Children and pets are especially vulnerable because they often put plants in their mouths without knowing the consequences.
  • Wear gloves when handling unknown plants: Some plants can cause skin irritation or burns even upon contact.
  • Seek medical help immediately if poisoning is suspected: If you or someone close to you consumes a poisonous plant, call an ambulance or contact a poison control center immediately.

What to Do in Case of Poisoning?

If you suspect poisoning from a plant, it's important to act quickly:

  1. Call emergency services or contact a poison control center.
  2. Do not induce vomiting unless instructed by medical personnel.
  3. Save a sample of the plant or fruit so doctors can identify the source of poisoning.
  4. Follow the instructions of medical personnel and seek professional help as soon as possible.

Conclusion

Exotic plants and their fruits can be beautiful and fascinating, but it's important to remember that some of them are poisonous and can pose a serious health risk. Awareness and caution are key to safely enjoying the beauty and diversity of the plant kingdom. Never underestimate the potential danger and always educate yourself about plants before you decide to grow them or consume their fruits.

If you have any doubts, it's better to be safe and consult an expert. Your health and the health of your loved ones should always come first.

In short: Toxic compounds usually sit in seeds, sap and unripe fruit – hypoglycin A in unripe ackee, cerberin in cerbera, strychnine in nux-vomica seeds, thevetin in yellow oleander. In manchineel all parts are toxic, including sap on the skin. Never taste unknown fruit and contact a poison control centre if poisoning is suspected.

Sugar apple heightup to 6 m (much smaller in indoor conditions)
Sugar apple winter dormancy10–15 °C, no fertilising, very sparing watering
Cape gooseberry heightapprox. 1 m, prefers partial shade
Large-leaved lupine50–160 cm tall, flower cluster up to 40 cm long
Squirting cucumber minimummust not stay below 10 °C for longer periods
Main toxins mentionedhypoglycin A, curcin, cerberin, strychnine, thevetin, lupanine

Recently, the cultivation of many exotic plants has become increasingly popular here as well. However, some of them can be dangerous as they contain substances that are toxic to the human body. Such plants include, for example, Cape gooseberry (lat. Physalis peruviana). Ripe Cape gooseberry fruits are commonly consumed, but in their unripe state, they are toxic to humans, just like the rest of the plant. It's similar with cherimoya (lat. Annona cherimola). The fruits of this plant are very tasty, but beware of the seeds contained within them - in larger quantities, they are poisonous. Among rather unknown plants is the squirting cucumber (lat. Ecballium elaterium). This plant resembles a cucumber and its danger lies in the fact that slimy juice accumulates in the green fruits, which can squirt out forcefully from the ripe fruit even with a light touch. Contact of the slime with skin can cause severe irritation. Symptoms of poisoning may occur with overdose from a decoction of this plant. Therefore, use this plant for medicinal purposes only with expert recommendation in precisely determined doses. On the other hand, a plant that has already become naturalized here is the large-leaved lupine, also known as garden lupin (lat. Lupinus polyphyllus). Although not widely known about this plant, its seeds in particular are highly toxic.

Cape Gooseberry

Cape gooseberry (lat. Physalis peruviana) is a plant from the nightshade family (lat. Solanaceae). Unripe fruits contain the mildly poisonous bitter substance physalin and the carotenoid physalein, while the leaves contain pectic and resinous substances. After consuming a larger amount of any part of the plant, stomach discomfort and vomiting may occur. If poisoning is suspected, do not induce vomiting and immediately call the emergency services or your local poison control centre.

Cape Gooseberry and Its Cultivation

Cape gooseberry grows to a height of approximately 1 m. This plant is a close relative of the Czech ground cherry (lat. Physalis alkekengi). Physalis is an undemanding plant to grow that prefers partial shade. It spreads quite quickly, so over time it can suppress surrounding plants. Thanks to the decorative calyxes that envelop the fruit, Cape gooseberry is often used in dried flower arrangements. Ripe Cape gooseberry fruits have a refreshing taste and delicate aroma. They are excellent in fruit salads.

Sugar Apple

Sugar apple (Annona squamata, also known as sweetsop) is an exotic plant with very tasty fruits that many people consider to be among the best. The flesh inside the fruits is creamy white in color, delicate and aromatic in taste. The seeds contained in the flesh are poisonous in larger quantities. Be careful also with the juice from the seeds, as contact with the eyes can even cause blindness. However, if you follow basic hygiene rules, there is almost no danger. Before serving sugar apple fruits, don't forget to remove the seeds.

Sugar Apple and Its Cultivation

Sugar apple can grow up to 6 meters in height. However, in our conditions it grows to much smaller dimensions. It can even be grown in sufficiently bright apartments with higher air humidity. Sugar apples benefit from alternating periods of summer vegetation and winter dormancy. In summer, it is advisable to move the sugar apples to an outdoor location, in winter they appreciate a reduction in temperature to 10-15°C. In extreme cases, a reduction to around 18°C is sufficient. Sugar apples need to rest during winter, so don't fertilize them and water very sparingly in winter.

Large-leaved Lupine

Large-leaved lupine (lat. Lupinus polyphyllus) is a relatively widespread plant in our region. Lupine seeds contain the alkaloids lupinidine, lupanine and the glycoside lupinid. These alkaloids severely damage liver tissue and can cause damage to the nervous system, heart and kidneys. Intoxication manifests itself through salivation, vomiting, cramps, restlessness, and heart rhythm disorders. Severe poisoning can result in paralysis of the respiratory organs or even death. In case of intoxication, it is necessary to seek medical help quickly. Experimenting with the seeds of this plant is a major health hazard.

Lupine and Its Cultivation

Lupine is a perennial herb that grows to a height ranging from 50-160 cm. The inflorescence forms a cluster of flowers up to 40 cm long, which can be blue, purple, pink or white. It always depends on the specific variety. Lupines thrive best in sunny to semi-shaded locations in deep and nutritious soil; adding peat will only benefit the plant. Avoid planting lupines in calcareous soils, where they would probably not grow. In winter, lupines are sensitive to excessive moisture and some "exotic" species also to severe frost, so it is better to cover them slightly for winter. Lupines do not tolerate frequent transplanting.

Interesting Fact

Varieties have been bred that contain only minimal amounts of alkaloids, so they can be used as livestock feed and game pasture. Seeds of this type of lupine were even used as a coffee substitute.

Squirting Cucumber

Squirting cucumber (Latin: Ecballium elaterium) is sometimes called the "exploding cucumber" because fluid accumulates in its fruits. When ripe, the fruits burst open violently and shoot out the seeds along with the fluid. This fluid can cause severe skin irritation upon contact, especially in sensitive individuals. Squirting cucumber has a laxative effect, and overdosing can cause vomiting and, in serious cases, even poisoning. Therefore, it is advisable to use squirting cucumber only under professional supervision and in precisely determined doses.

Squirting Cucumber and Its Cultivation

Squirting cucumber is often grown as an annual plant because it cannot survive frost. However, thanks to its robust taproot, the squirting cucumber can survive long periods of drought. In its native habitat, it is a perennial plant. It resembles a cucumber in appearance, except its leaves are more hairy. Squirting cucumber thrives best in a sunny location and well-drained soil. If you have enough space, you can grow squirting cucumber even through winter, but you must not expose it to temperatures below 10°C for extended periods.

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