21 Beautiful but Poisonous Flowers and Deadly or Dangerous Plants (2024)

Looks can be very deceiving when it comes to flowers. So, today, we will offer you a list consisting of 21 gorgeous but deadly flowers and a quick summary of some of the deadliest plants in the world.

However, just like us, plants have been evolving for hundreds of thousands of years and have developed different means to protect themselves. For this reason, they flourished from thorns and spines to deadly chemicals.

Therefore, in this article, we’ll discuss 21 deadly flowers to watch out for. These dangerous flowers look harmless to the naked eye, but they also contain toxins and poisonous substances that can be lethal for both humans and pets. Moreover, since we are in the fun section of this website, we will also present you with some of the deadliest plants and most poisonous specs of vegetation that Mother Nature created for our amazement (and disgust). So, without any further introductions, let’s begin our “deadly journey”.

Our List of Beautiful But Deadly Flowers

1. The Queen of Poisons, Aconitum 21 Beautiful but Poisonous Flowers and Deadly or Dangerous Plants (1)

The first entry on our list of deadly flowers is Aconitum, known as wolfsbane. It belongs to the buttercup family but there is nothing sweet or nice about it (except for its looks). A few drops of juice from this deadly flower’s roots and you have some heart failure and cardiac muscles’ paralysis to deal with – if you have the time, of course. Therefore, try to stay away!

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Other Names:

Aconite, Monkshood, Wolf's-bane, Leopard's bane, Devil's helmet

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Native:

Mountainous parts of the Northern Hemisphere

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Toxicity:

Deadly. It contains aconitine, a potent neurotoxin, mostly in its roots and tubers.

2. The Fragrant Killer, Oleander

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Next, Oleander, known since Ancient Greece and Rome and described by Plinius, is one of the most toxic and deadliest garden plants in the world. So, you may use it as an ornamental shrub or hedge, but keep in mind all the plant’s parts are poisonous. Therefore, if you or your pet eat by accident an oleander plant’s part, the poisoning symptoms can range from vomiting and diarrhea to seizures, coma, and death. In conclusion, make sure you don’t touch it, either, as some people suffer severe skin reactions upon contact.

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Other Names:

Nerium, Nerium Oleander

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Native:

Mediterranean region. Grown as ornamental plants worldwide.

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Toxicity:

Deadly. All its parts contain the cardiac glycosides oleandrin and oleandrigenin.

3. The Innocent Killer, Lily of the Valley

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Should you ingest such flower – and we understand the appeal, it smells terrific – expect the worst. Lily of the Valley is a “grade 1” deadly flower on the poison scale. Also, it acts through the cardiac glycosides, which create a similar effect with the Digitalis exposure, meaning that this delicate, gorgeous, tantalizing flower is also one of the deadliest killer plants in existence.

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Other Names:

Convallaria majalis, May bells, Our Lady's tears, and Mary's tears

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Toxicity:

Deadly. All parts are highly poisonous and contain saponins and Aze, a poisonous animo acid.

4. The Angel’s Trumpet, Brugmansia

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One of the most toxic ornamental plants out there, Brugmansia contains alkaloids that you do not want to ingest or touch. Moreover, even if the toxins of this plant – scopolamine, atropine, and hyoscyamine – found excellent uses in medicine and pharmacology, the use of any plant’s parts can be deadly without a doctor’s supervision. So, we strongly suggest keep your distance!

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Other Names:

Brugmansia ‘Feingold’

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Native:

Tropical parts of South America, Andes, Venezuela, Chile, south-eastern Brazil. Grown as ornamental plants worldwide.

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Toxicity:

Deadly. All parts are highly poisonous and contain tropane alkaloids, including hyoscine (scopolamine), hyoscyamine, norhyoscine.

5. The Mind-Altering Honey, Azaleas

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All parts of azaleas are poisonous for humans and pets. Therefore, while gorgeous in looks, azaleas are deadly flowers containing grayanotoxins. So, ingesting a small quantity of the plant will not likely lead to severe illnesses, but consuming a larger part of the plant correlates with life-threatening conditions.

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Other Names:

Rhododendron

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Native:

Asia, Europe, and North America. Grown as ornamental plants worldwide.

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Toxicity:

Deadly. It contains andromedotoxins in its leaves and nectar. Its nectar can be fed to bees and used to create lethal honey, known as ‘mad honey’.

6. The Lazarus Bell, Checkered Lily

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You may have heard about this flower as a snake’s head fritillary. So, as the title suggests, this plant is poisonous like a venomous snake. Moreover, just like the lily of the valley, it is a grade-1 poisonous plant that you should handle with a lot of care.

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Other Names:

Snake's head, Chess flower, Frog-cup, Leper lily, Drooping tulip, Fritillary

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Native:

Europe and western Asia

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Toxicity:

Deadly. Its bulbs contain poisonous alkaloids.

7. The Deadly Nightshade, Belladonna

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This perennial herbaceous plant in the nightshade family Solanaceae is as deadly as its reputation. Moreover, you probably have read crime novels or seen CSI TV shows related to belladonna poisoning. According to the USDA Forest Service, belladonna means “beautiful woman” in Italian, but you knew that probably. Here are other interesting facts about this poisonous flower!

With all these highly toxic compounds, one might wonder why deadly nightshade was and is still being used by people. As with many poisonous plants there are many reasons for their use, both good (medicinal) and bad (weapons and poisons). The Romans used belladonna as a biological weapon to contaminate their enemies’ food reserves. In Shakespeare’s play, Macbeth, the Scottish army defeats the Danes by contaminating their liquor supply with belladonna, inducing a deep, comatose sleep, and murdering them in their hapless state. Deadly nightshade was also an important plant in the medieval witches’ pharmacopoeia in brews and salves, used as a constituent in their flying ointments. During World War II, the Germans invented a deadly, odorless nerve gas and the only antidote to its paralyzing effects turned out to be atropine.

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Other Names:

Atropa Belladonna

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Native:

Europe, North Africa, and Western Asia

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Toxicity:

Deadly. One of the most toxic plants. The entire plant contains tropane alkaloids.

8. The Twining Vine, Jessamine – Deadly Flowers

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Carolina jessamine is a common garden plant loved for the profusion of yellow flowers it yields in the summer. However, it is also one of the deadliest flowers out there. It contains neurotoxic alkaloids that affect nerve endings and cause paralysis, muscle weakness, and clonic convulsions in animals and humans. Also, all parts of the plant are poisonous, but you have to watch out for the flowers and the roots with even more care.

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Other Names:

Gelsemium sempervirens, Yellow Jessamine, Carolina jasmine, Evening trumpet flower, Gelsemium, and Woodbine.

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Native:

Subtropical and tropical America and southeastern and south-central United States

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Toxicity:

All its parts contain the toxic alkaloids gelsemine and gelseminine and its sap can cause skin irritation.

9. The Philosopher’s Bane, Hemlock

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Poison hemlock (Conium maculatum) is one of the most poisonous and deadliest plants in the world. However, you should make the difference between poisonous hemlock and Queen Anne’s lace (Daucus carota). Poisonous hemlock grows throughout the United States. It is toxic to pets, livestock, and humans, so make sure you keep an eye on it should you choose to grow it in the garden.

Even though both are in the Apiaceae family and have hollow stems, poison hemlock’s stem is hairless and has purple blotches. Also, even a very young poison hemlock will display the purple blotching. On the other hand, the stem of Queen Anne’s lace doesn’t have purple blotches and is hairy. See the photos below for a comparison.

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Other Names:

Conium maculatum, Poison hemlock

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Native:

Europe and North Africa

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Toxicity:

Deadly. This is the lethal plant that killed Socrates. It contains conium and multiple toxic alkaloids.

10. The Star of Bethlehem, Ornithogalum – Deadly Flowers

21 Beautiful but Poisonous Flowers and Deadly or Dangerous Plants (37)This cool-season perennial of the Lily family is poisonous in all its parts, but make sure you stay away from its bulbs and roots. This deadly flower – that blooms in late spring or early summer – contains cardiac glycosides that have life-threatening side effects. Also, you should never use it as medicine.

However, in order to stay away, you should know how to recognize it. So, its flowers are a showy white with six white petals with a noticeable greenish stripe down the middle on the back of the petals. Last but not least, you should also keep your dog away from it, as it can really harm him too!

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Other Names:

Ornithogalum umbellatum

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Native:

Europe and Southern Africa

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Toxicity:

Some of the deadly plants from this genus contain alkaloids and cardenolides in their bulbs.

11 More Deadly and Killer Flowers You Should Also Know About

Also, as we said, we will resume here 11 more poisonous flowers you should know about before considering planting such flowers and ornamentals in your home or garden! So, let’s learn a little about 11 other deadly flowers!

  1. Castor Oil Plant – Nausea, bloody diarrhea, blood pressure drops, and intense abdominal pain are some of the symptoms of ricin poisoning which in high doses will trigger death. Also, according to the Guinness Book of World Records, 2007, the castor plant is the most poisonous plant in the world.;
  2. English Ivy – this beautiful indoor plant cleans the air and makes an excellent hanging vegetal ornament, but keep in mind it is toxic to pets and children;
  3. Dracula’s Flower (Dracunculus vulgaris) – hard to ingest, as when in bloom, its flowers reek of rotten meat;
  4. Titan Arum, also known as the corpse flower for its rotting-meat smell;
  5. Gypsophila, known as baby breath, looks wonderful but can cause skin irritation, vomiting, nausea;
  6. Bleeding heart, a gorgeous plant will all parts poisonous;
  7. Bloodroot, beautiful, but leading to organ failure if ingested;
  8. Foxglove, containing digitalis, fatal;
  9. Morning glory, smell it only, as it can lead to diarrhea, vomiting, or hallucinations;
  10. Peace lily, one of the most beloved indoor plants that clean the air – just make sure it does not get in contact with children and pets;
  11. Iris, one of those toxic flowers that look gorgeous but can lead to vomiting, fever, or diarrhea for people and pets. Also, in the classic novels, ladies used this deadly flower to poison themselves.

Final Thoughts

Finally, that was our list of the 10 most beautiful but lethal flowers and eleven more dangerous plants you should stay away from. So, tell us what you think about these powerful plants down below. Also, if you’d like us to add one or more dangerous and poisonous plants to the list, let us know in the comments section. Not to mention that I am truly interested to find out if you had any experience with these twenty-one greed murderers. However, I hope you don’t have any experience of such a kind to share with us!

Until then, make sure to be very careful around these plants, as they are dangerous for both humans and pets.

You Had Me at Gardening

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21 Beautiful but Poisonous Flowers and Deadly or Dangerous Plants (44)

About the Author - Denis Sgarbura

Hello. I’mDenis. My passion for growing plants started when I was around 10 or 11 years old. My grandpa loved to take care of roses. He had a breathtaking rose garden. I wanted one badly. So, I started my own. I was stoked when my roses showed signs of growth.It became a competition: my garden vs. his garden. He won every time, but I never gave up and did my best to make it extraordinary. I read everything there was to know about roses and how to grow them.

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