According to the Guinness Book of World Records, based on the amount of poison it takes to kill a human, the most poisonous common plant in the world is the castor bean (Ricinus communis).
Dendrocnide moroides, commonly known in Australia as the stinging tree, stinging bush, Queensland Stinger or gympie-gympie, is a plant in the nettle family Urticaceae found in rainforest areas of Malaysia and Australia.
Oleander (Nerium oleander)
Commonly planted in Southern gardens, oleander is one of the most poisonous plants you can grow due to the poison, oleandrin. This toxin damages the heart and will cause heart arrhythmia and can even cause death.
Belladonna. Its name might mean “beautiful woman” in Italian, but this decorative shrub—also known as deadly nightshade—is quite the femme fatale. Ingesting any part of it can cause hallucinations and convulsions, and one leaf of the herbaceous plant—one of the deadliest on Earth—can readily slay an adult.
Aconitum, part of the buttercup family, goes by various nicknames depending on the exact species - Monkshood, Wolfsbane, the Queen of Poisons, or Devil's Helmet.
The Middlemist Red flower is probably the rarest flower in the world, and it can only be found in London and New Zealand. The Chinese botanist John Middlemist brought this plant to London in 1804. The flower, formerly thought to have disappeared from London, is no longer present in Asia.
1) Lily of the valley
While it may be easy to quickly fall in love with Lily of the Valley's sweet scent, this flowering plant is highly poisonous. Its toxic compounds called cardiac glycosides can leave you feeling dizzy, cause vomiting and cover you in a rash.
Known colloquially as the gympie gympie (from the Gubbi Gubbi/ Kabi Kabi name for the plant, gimpi gimpi), gympie stinger, and giant stinging tree (D. excelsa), this plant has the dubious honour of being arguably the most painful plant in the world.
Perhaps the most famously lethal on our list is Atropa belladonna, the aptly named Deadly Nightshade. This toxic plant belongs to the same family as tomatoes, potatoes and aubergines, and can be found across Europe, including in Britain, as well as North Africa, Western Asia and some parts of the USA and Canada.
Foxglove is notable for its tubular-shaped purple, pink, white, and yellow flowers. Depending on the species, the digitalis plant may contain several deadly toxins, leading to its other nickname, Witch's Glove.
Known as Gympie-gympie in Australia and salat in Papua New Guinea, contact with this leaf can result in human death, more often extreme pain that can last for months. Stinging hairs deliver a potent neurotoxin when touched. Leaf has medicinal purposes in some PNG tribes. Scientific name is Dendrocnide moroides.
Deadly Nightshade (Atropa belladonna)
Nightshade contains atropine and scopolamine in its stems, leaves, berries, and roots, and causes paralysis in the involuntary muscles of the body, including the heart. Even physical contact with the leaves may cause skin irritation.
The Bottom Line. Serious poisoning is unlikely when small pieces of azalea or rhododendron are swallowed. But swallowing large amounts of any part of the plant or honey made from these flowering plants can cause life-threatening symptoms.
Pink oleander (Nerium oleander)
Lavender. The scent of lavender is well known for being relaxing. Scientifically, it has been shown to reduce blood pressure and heart rate, which is beneficial if you find yourself struggling with anxiety when you get into bed.
Jasmine - The calming scent of jasmine provides therapeutic benefits. Jasmine is often infused into medicinal alternatives for conditions like depression, stress, anxiety, and even insomnia. Chamomile - Chamomile is another well-known plant lauded for its relaxation benefits. Chamomile inspires calm.
The mimosa pudica — also known as the sleepy plant or touch-me-not — reacts dramatically when touched or shaken. When touched lightly, its leaves collapse, two by two, until the whole cluster closes up.
Grandmothers and grandfathers with a green thumb might remember it: the Scabiosa. A special flower, which until recently, had been forgotten. The Scabiosa, also known as 'pincushion flower', was grown from seed, had medium size flowers with a delicate stem and grew mostly in blue tones.
The Middlemist Red is considered the rarest flower in the world. It is found in London and New Zealand, with only one specimen in each location. It used to be native to Asia but is now extinct on the continent. John Middlemist was responsible for bringing the flower to London in 1804.
Aconitum napellus (A. napellus, also known as monkshood or wolfsbane) is a perennial herb often grown as an ornamental plant due to its attractive blue to dark purple flowers. All parts of the plant, especially the roots, contain toxins. Aconitine is the most dangerous of these toxins.
He has one of the rarest plants in Australia - only one individual is known in the wild, the Ormeau Myrtle.
Rainbow Roses are also known as Happy Roses or Kaleidoscope Roses. These blooms may look like they were plucked out of a story book, but trust us when we say they're 100% real. These unique blooms boast vibrant and brightly coloured petals, making them the life of the party or centre of attention anywhere you put them.
While black roses do not truly exist in mother nature, their symbolism very much does in culture and everyday life. Many times, black roses are actually exquisite tones of deep red, maroon or purple blooms. To achieve a darker black hue, florists will typically dye, spray, dip or even burn their flowers.