Poisonous Flowers for Humans – 11 Not to Miss!

In a world where gardening and floral arrangements reign supreme, knowing the ins and outs of poisonous flowers for humans becomes an essential skill for both enthusiasts and horticultural daredevils.

I have recently liked adding flowers to my desserts and culinary creations, and it has been an incredible learning curve. Knowing what to pick and what to avoid is essential to preventing any surprise emergency visits to the hospital! I’ve researched some of the most commonly found poisonous plants and how to identify them.

Whether you are designing a stunning backyard, weeding out the non-edibles, or ensuring the safety of curious children and mischievous pets. Be sure to understand the hidden dangers of dangerous flowers lurking amidst the petals. It can make all the difference.

Delve into this horticultural odyssey as we unravel the secrets of these seemingly innocent blossoms. Within their petals lie hidden dangers that only the keenest of observers can discern.

Table of Contents

Deadly Nightshade

Also known as Atropa belladonna, it is a beautiful yet dangerous plant with deadly flowers and a dark reputation. Its glossy black berries and bell-shaped purple flowers may entice the eye, but lurking within lies a potent threat.

close up of deadly nightshade

Look for a perennial herb with robust, branching stems growing up to 5 feet tall. Its leaves are dark green, alternate, and possess a distinctive oval shape with pointed tips.

The striking purple bell-shaped deadly flower emerges from the axils of the leaves and gives way to the plant’s characteristic black, shiny berries.

Key Information:

  • Toxicity: Deadly Nightshade is highly toxic to humans and animals.
  • Toxic Compounds: The plant contains several toxic alkaloids, including atropine, scopolamine, and hyoscyamine.
  • Symptoms: Ingestion or contact with Deadly Nightshade can lead to a range of symptoms. Dilated pupils, blurred vision, severe dehydration, rapid heartbeat, paralysis of involuntary muscles, difficulty breathing, hallucinations, confusion are the main ones. In extreme cases, seizures, and coma.
  • Possible Fatality Reason: Deadly Nightshade can be fatal. This is primarily due to its effects on the central nervous system and the heart if consumed in large quantities.
  • Origin: Deadly Nightshade is native to Europe, North Africa, and Western Asia.

Lily of the Valley

Lily of the Valley has broad, lance-shaped leaves that grow in a basal rosette. It produces small, white bell-shaped flowers that hang from a slender stem. The plant has a low-growing habit and spreads through underground rhizomes.

lily of the valley bush

Despite its toxic flowers, Lily of the Valley is appreciated for its ornamental value and fragrance. It is often used in floral arrangements and perfumes. Traditional medicine and home remedies use these toxic plants in small, controlled doses to treat certain heart conditions under medical supervision.

However, self-medication or consumption without proper expertise can be extremely dangerous and is not recommended.

Key Information:

  • Toxicity: Lily of the Valley is classified as highly toxic to humans and pets. Even small ingestion of these poisonous plants can have adverse effects and should be cautiously treated.
  • Toxic Compounds: Contains cardiac glycosides, particularly convallatoxin, and convallarin, the main toxic compounds responsible for their poisonous nature. These glycosides affect the heart muscle and can disrupt its normal functioning.
  • Symptoms: Ingestion can lead to various symptoms. This can include nausea, vomiting, abdominal pain, irregular heart rate, low blood pressure, dizziness, and in severe cases, cardiac arrhythmias and collapse.
  • Possible Fatality Reason: Contains toxic compounds that can be fatal if ingested in large quantities. They are considered highly poisonous plants, especially their leaves, deadly flowers, and berries.
  • Origin: Lily of the Valley (Convallaria majalis) is a perennial flowering plant native to the Northern Hemisphere, mainly in Europe and North America.


Despite its deadly reputation, the Oleander plant can’t resist playing a double agent. It’s a popular plant for adding color to gardens and landscapes. Just make sure to keep your distance and appreciate it from afar.

oleander bush with dark pink flowers

Oleander showcases long, lance-shaped leaves that are leathery to the touch. Its poisonous flowers are real head-turners, coming in various colors like pink, red, white, or yellow. Demanding everyone’s attention.

Key Information:

  • Toxicity: It’s classified as highly toxic to humans and animals. Don’t be fooled by its pretty appearance—this one means business.
  • Toxic Compounds: This violently toxic plant has compounds up its sleeve, with oleandrin and nerioside. These target the heart and can wreak havoc on its rhythm.
  • Symptoms: Symptoms of oleander poisoning include nausea, vomiting, stomach pain, irregular heartbeat, dizziness, and even loss of consciousness.
  • Possible Fatality Reason: Ingesting any part of this ornamental plant can lead to death in humans and furry friends.
  • Origin: Oleander (Nerium oleander) hails from the Mediterranean region.

Poison Hemlock

Poison Hemlock is like a stealthy assassin, disguising itself with tall, hollow stalks that reach for the sky and lacy, fern-like leaves that resemble a fancy Victorian outfit.

poisen hemlock flowers

It doesn’t have any redeeming qualities when it comes to its uses. Its toxicity overshadows any potential benefits. Let’s just appreciate its unique appearance from a safe distance and leave it be.

Key Information:

  • Toxicity: Highly toxic, and ingesting this deadly flower can be life-threatening.
  • Toxic Compounds: The entire plant is armed with toxic compounds such as coniine and gamma-coniceine, which wreak havoc on your nervous system.
  • Symptoms: If you mistakenly tango with this plant, prepare for unpleasant common symptoms, including nausea, severe vomiting, tremors, muscle paralysis, and even difficulty breathing with respiratory organ failure.
  • Possible Fatality Reason: Ingesting even a small amount of this mischievous plant and its deadly flowers can lead you straight down a treacherous path toward potential fatality.
  • Origin: Poison Hemlock (Conium maculatum) originally from Europe and Western Asia. It’s like the wild child of the plant world. Lurking in meadows, roadsides, and wastelands.

Angels Trumpet

Scientifically known as Brugmansia, its elongated, glossy leaves identify it. Its drooping, poisonous flowers hang gracefully like celestial trumpets, showcasing colors—whites, yellows, peaches, and pinks. Angel’s Trumpet mesmerizes the eyes and seduces the nose with its heavenly fragrance.

pink and white angels trumpet flowers

As the sun sets, its dangerous flowers unleash their captivating scent. In turn attracting nocturnal visitors like moths and hummingbird moths.

Key Information:

  • Toxicity: The toxicity level of Angel’s Trumpet is high, demanding utmost caution and respect. Even small amounts of ingestion can cause severe illness. Making it crucial to keep it out of reach of children and pets.
  • Toxic Compounds: Angel’s Trumpet harbors potent toxic compounds such as tropane alkaloids, including scopolamine and atropine. These compounds disrupt the normal functioning of the nervous system, contributing to its dangerous nature.
  • Symptoms: If you accidentally ingest Angel’s Trumpet, various symptoms may arise. This can include nausea, vomiting, confusion, hallucinations, rapid heart rate, and even loss of consciousness.
  • Possible Fatality Reason: Ingesting any part of this plant and its dangerous flowers can lead to severe consequences. Making it a hazardous choice for consumption.
  • Origin: Angel’s Trumpet originates from the exotic lands of South America, spreading its wings of beauty across the continents.

Wolf’s Bane

Wolf’s Bane traces its roots back to the mountainous regions of Europe and Asia. It’s like a wild wanderer, thriving in rugged landscapes and captivating adventurous souls.

wolf's bane flowers in the sunshine

Imagine tall, elegant spikes of colorful, poisonous flowers. It displays a range of shades, including purples, blues, and whites. Look for those signature toxic flowers with a hooded shape; the leaves are deeply lobed, adding a touch of intricacy to their appearance.

Despite its fierce reputation, Wolf’s Bane, a member of the Buttercup family, was utilized in traditional medicine for its potential healing properties. However, it’s crucial to note that any use of lethal plants should be done under the guidance of experts. It carries significant risks.

Key Information:

  • Toxicity: The toxicity of Wolf’s Bane is significant, requiring knowledge if you are to acquire one. Even small amounts of exposure can have severe consequences, making handling this plant carefully and avoiding ingestion essential.
  • Toxic Compounds: Wolf’s Bane contains highly toxic compounds, including aconitine and other alkaloids. These compounds interfere with the normal functioning of the nervous system, contributing to its potential danger.
  • Symptoms: If one falls victim to Wolf’s Bane, common symptoms may include: nausea, vomiting, abdominal pain, muscle weakness, blood pressure, heart irregularities, and even respiratory and kidney failure.
  • Possible Fatality Reason: Ingesting any part of Wolf’s Bane can have severe consequences and be life-threatening.
  • Origin: From the mountainous regions of Europe and Asia, it established its wild presence in rugged landscapes.

Leopard’s Bane

Known as Doronicum, it roams the meadows and forests of Europe and Asia. It brings a touch of wilderness to gardens, captivating nature enthusiasts with its untamed beauty.

leopard's bane outside

Bright yellow daisy-like flowers add a burst of cheerfulness to any landscape. The poisonous flower rises on a sturdy stem, proudly displaying its yellow radiance. You can spot the distinct, heart-shaped leaves that are furry to the touch.

In traditional medicine, Leopard’s Bane has been used externally for various purposes, such as treating wounds and bruises. However, as with all poisonous plants, caution is necessary. Internal usage can be hazardous because it is extremely toxic.

Key Information:

  • Toxicity: The toxicity level is significant; even small amounts of ingestion can have severe consequences. Making it crucial to handle the entire plant carefully and avoid any interactions that may put one’s health at risk.
  • Toxic Compounds: Leopard’s Bane contains various toxic compounds that can differ among species. They disrupt the body’s normal functioning, contributing to its potential danger.
  • Symptoms: In the unfortunate event of ingesting Leopard’s Bane, symptoms may include nausea, vomiting, abdominal pain, dizziness, and heart irregularities.
  • Possible Fatality Reason: Ingesting any part of this highly poisonous plant can lead to severe consequences and even death.
  • Origin: Hails from the meadows and forests of Europe and Asia.

Morning Glory

Morning Glory twines and climbs gracefully with blossoms displaying a dazzling array of hues. With its toxic flowers, from brilliant blues and purples to radiant pinks and whites, Morning Glory is an authentic palette of natural beauty. 

many morning glory flowers outside

Watch out if you are planting this one in your garden; it can take over VERY quickly!

The trumpet-shaped toxic flowers open in the morning and close by the afternoon. Hence the name “Morning Glory.” The heart-shaped leaves are usually green and may have a slightly fuzzy texture, making them all the more inviting to touch.

Various cultures have valued Morning Glory for its versatility throughout history. From being used as a natural dye for fabrics to symbolizing love and affection, it holds a special place in nature and human hearts.

Key Information:

  • Toxicity: The toxicity varies depending on the species and the specific alkaloids present. While some species may contain potentially toxic compounds, the level of toxicity is generally low compared to other highly toxic plants. However, caution is recommended to prevent potential adverse effects.
  • Toxic Compounds: Morning Glory species that contain toxic compounds often contain ergoline alkaloids, such as ergonovine and ergine (also known as LSA). These alkaloids can have psychoactive properties and may pose risks if consumed in high doses or inappropriately prepared forms.
  • Symptoms: In the unlikely event of consuming large amounts of certain toxic species of Morning Glory, symptoms may include nausea, vomiting, abdominal pain, dizziness, hallucinations. Even possible complications affecting the nervous system. It’s crucial to exercise caution and avoid consuming any unknown or potentially toxic varieties of Morning Glory.
  • Possible Fatality Reason: Certain species of Morning Glory, particularly those containing ergoline alkaloids, can have potential toxicity if consumed in large quantities or certain preparations. However, it’s worth mentioning that cases of severe toxicity from Morning Glory ingestion are rare.
  • Origin: Scientifically known as Ipomoea, it has roots in various regions worldwide, including tropical and subtropical areas.


Foxglove stands tall and proud, adding a touch of elegance to any garden or landscape. Each toxic flower of Foxglove is like a tiny, delicate bell hanging from the stem. The poisonous flowers come in various shades, from soft pastels to vibrant hues, creating a delightful visual feast.

one foxglove flower blossoming

The tall spikes are adorned with charming bell-shaped flowers. The soft and fuzzy textured leaves are lance-shaped and often have serrated edges, adding a touch of intricacy to their appearance. 

Its long history of medicinal use comes from its leaves, from which a powerful cardiac medication called digitalis is derived. Under the guidance of medical professionals, digitalis has been used to treat various heart conditions.

Key Information:

  • Toxicity: This poisonous flower should be approached with utmost caution. It’s essential to remember that the poisonous plant’s medicinal use should only be undertaken under the supervision of medical professionals. They can accurately determine dosage and monitor its effects.
  • Toxic Compounds: The primary toxic compounds found in Foxglove are cardiac glycosides, including digitoxin and digoxin. These compounds can affect the cardiovascular system. In turn affecting the heart’s rhythm and potentially leading to severe complications.
  • Symptoms: Ingestion of this poisonous plant can lead to nausea, vomiting, stomach pain, irregular heartbeat, dizziness, and even heart failure. It’s crucial to exercise extreme caution with deadly plants and avoid ingestion or usage without proper expertise and guidance.
  • Possible Fatality Reason: The deadly flowers and leaves contain toxic compounds called cardiac glycosides. If ingested in significant quantities or improperly used, Foxglove’s toxic flowers and leaves can be life-threatening.
  • Origin: Otherwise known as Digitalis, it is native to various regions, including Europe, North America, and Asia.


As winter fades away and the world awakens, Daffodils emerge from the ground. They announce the arrival of a new season filled with possibilities and fresh beginnings.

close up of a daffodil

The toxic flowers of daffodils feature unique trumpet-shaped structures that come in various sizes and forms, from classic yellow flowers to elegant white ones. The toxic flowers usually have six petals arranged in a trumpet shape, with a contrasting center known as the corona.

The sturdy stems and long, slender leaves of Daffodils define their characteristic shape and color, making them an easily recognizable poisonous species.

Daffodils are hardy perennials. Meaning they return year after year, gracing us with their presence and reminding us of the cyclical nature of life.

Key Information:

  • Toxicity: Daffodils have a moderate to low toxicity level. Primarily due to their bitter taste that naturally deters ingestion. Individual sensitivities can vary, and allergic reactions or adverse effects may occur in susceptible individuals.
  • Toxic Compounds: Daffodils contain various toxic properties, including alkaloids such as lycorine and galantamine. These compounds can adversely affect the digestive system and cause skin irritation in some individuals.
  • Symptoms: Ingesting can cause nausea, vomiting, diarrhea, abdominal pain, and in some cases, allergic reactions. Skin contact with the plant sap may also lead to dermatitis or skin irritation.
  • Possible Fatality Reason: While Daffodils are generally considered non-toxic to humans, all parts of the plant, including the bulbs, contain toxic compounds. However, severe toxicity cases from Daffodil ingestion are rare, as their bitter taste generally discourages consumption.
  • Origin: Daffodils, belonging to the Narcissus genus, are native to various regions, including Europe, North Africa, and Asia.


What is the most toxic flower to humans?

One flower known for its toxicity is the Aconitum, known as monkshood or wolfsbane. All parts of the plant, especially the roots, contain toxic alkaloids that can be harmful or fatal if ingested or mishandled.

What is the poisonous flower used in you?

The character uses a plant called Wolfsbane (Aconitum) as a poisonous flower. Wolfsbane, or aconite, has toxic alkaloids that are harmful if ingested or mishandled.

Which plant is poisonous to human?

Many plants are toxic to humans if ingested or mishandled. Some examples include the Castor Bean Plant (Ricinus communis), Oleander (Nerium oleander), and Datura (also known as Jimsonweed or Devil’s trumpet).

Are pink flowers poisonous?

The color of a flower is not an indicator of its toxicity. Pink flowers can be toxic or non-toxic, depending on the specific plant species.

Can roses be poisonous?

Roses (Rosa spp.) are not considered highly toxic. However, some people may have allergies or sensitivities to rose petals, which causes skin irritation or allergic reactions.

Is lily flower poisonous?

Lilies, such as Easter lilies (Lilium longiflorum) and tiger lilies (Lilium lancifolium), are highly toxic to cats. 

Consumption of these lilies can lead to kidney failure in felines. However, for humans, lilies are generally mild in terms of toxicity. Symptoms include gastrointestinal discomfort if ingested.

Blooms of Deception: The World of Poisonous Flowers and Their Potential Hazards to Humans Uncovered

While the world of flowers is undoubtedly captivating and diverse, it’s essential to be aware of the potential dangers.

Understanding the origin, possible fatality reasons, symptoms, toxic compounds, and toxicity of these flowers allows us to approach them cautiously and respectfully. 

While many poisonous flowers are safe to admire from a distance, avoiding ingestion or contact with toxic parts is crucial without proper expertise and guidance.

We can appreciate their beauty while prioritizing our well-being by fostering a deeper understanding of these poisonous flowers.

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Alex Tinsman
An avid plant and flower lover! Ever since he was little, plants, flowers, and shrubbery of all kinds filled his life. Alex credits this fascination with nature's beauty to his mother and grandmother who were - and still are - dedicated gardeners. It's now Alex's mission to pass that same love for plants onto others and show them it's as easy as pie to bring nature inside.

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