1. Oleander
Oleander, scientifically known as Nerium oleander, belongs to the Apocynaceae family. With over 400 species, it thrives in tropical climates and can withstand both drought and frost. Many people are drawn to this flower because of its attractive appearance, featuring a wide range of colors such as white, pale pink, dark pink, red-orange, and violet-red, with both single and double blooms. Its subtle fragrance is another reason it’s commonly planted in gardens.
However, caution is needed when dealing with Oleander. The flower contains potent toxins that can be fatal, especially for children. The toxic compounds in Oleander, oleandrin and neriin, are cardiac glycosides, present throughout the plant but concentrated in the sap. The bark also contains rosagenin, which has effects similar to strychnine. The plant’s milky white sap is extremely toxic and poses serious health risks.


2. Azalea
Azalea is a vibrant ornamental plant often grown to decorate homes during the Tết holidays. The flowers of the Azalea feature multiple layers of curled petals, giving it an intricate and captivating appearance. Its gentle fragrance makes it a popular choice for festive displays.
However, this beautiful flower is also highly toxic. The petals contain toxic compounds such as andromedotoxin and arbutin glucoside. Azalea is considered dangerous as all parts of the plant are poisonous. It is advised not to handle the flowers. The first signs of poisoning include nausea, fatigue, difficulty breathing, drooling, and vomiting. Additionally, those poisoned may experience dizziness and a loss of balance. A mere 100-225 grams of Azalea leaves can be lethal to a 25kg child. In case of poisoning, it is crucial to move away from the flower, get to a well-ventilated area, and seek immediate medical attention.


3. Tulip
Tulip, also known as the tulip flower or diamond lily, is a flowering plant in the Liliaceae family. It is a herbaceous plant with a bulbous structure. Tulip leaves are long and lance-shaped, glossy green, and wrap around the vibrant, green stem. The flowers are bell-shaped and bloom at the tips of sturdy stems. Tulips come in both single and double-flower varieties, with vivid colors including white, yellow, pink, purple, red, and orange, often with stripes or color blends. The entire plant exudes elegance, grace, and vitality.
Despite their beauty, tulip bulbs contain tulipene, a toxic substance. Ingesting this toxin can lead to dizziness and nausea. As a highly toxic plant, tulips should be handled with care, especially the bulbs, which are particularly dangerous for young children. If anyone is poisoned by this plant, immediate medical assistance should be sought by contacting the nearest healthcare facility.


4. Larkspur
Larkspur is a popular imported flower that has gained favor in recent years. Known for its durability and range of vibrant colors, it is a favorite choice for floral arrangements in homes. Larkspur is widely appreciated in European countries and is commonly cultivated in Vietnam’s Da Lat region. The plant is resilient, symbolizing strong will, yet it remains gentle and pure. Its flowers come in various colors, such as white, pink, red, purple, and blue, making it a popular option for special occasions.
However, the U.S. Department of Agriculture has issued a warning that all species of Larkspur (Delphinium Ajacis) contain toxic diterpene alkaloids. These compounds disrupt the nervous system and can lead to paralysis, including that of the heart, which can be fatal if consumed in sufficient quantities. In North America, Larkspur is a major cause of livestock poisoning, particularly in mountainous areas. Historically, the flower was regarded as a crucial plant for making insecticides, dating back to the time of the Pharaohs. In India, Larkspur seeds are used as a pesticide.


5. Daffodil
Daffodil has a bulb like an onion, with long, thin leaves resembling garlic but more delicate, arranged on either side of the stem. The flower consists of six petals, with a central, enlarged stamen forming a cup-like shape in a light greenish-yellow hue. Many Vietnamese families choose daffodils for their Tet celebrations, hoping for the flowers to bloom on the eve of the Lunar New Year, as they symbolize prosperity, longevity, and good fortune in the coming year.
However, according to reports from Phu Nu TP HCM, daffodils contain toxic alkaloids. The concern lies in their bulbs, which resemble onions, and their thin leaves, which resemble garlic, making it easy for elderly people or children to mistake them. Consuming a large amount of the plant can lead to symptoms such as dizziness, vomiting, confusion, seizures, and diarrhea. Notably, the roots of daffodils contain around 0.06% narcissin, a toxic substance. The toxicity varies depending on the age of the plant. If ingested before the flower blooms, narcissin causes pupil dilation, dry mouth, and rapid heartbeat. After flowering, the symptoms include excessive salivation, sweating, nausea, and diarrhea.


6. Lily Amaryllis
The red lily, also known as Lily Amaryllis (scientific name: Hippeastrum puniceum), is a popular flower grown mainly for the Lunar New Year. The striking red flowers bloom from the bulbous stem, and it is admired for its enduring vitality and attractive, vibrant color.
However, according to Dr. Bùi Văn Lệ, a biologist from the University of Natural Sciences, HCM City, many common ornamental plants today contain toxins that can harm health if ingested in large quantities. The Lily Amaryllis is no exception. Its bulb contains lycorine, a toxin that can cause symptoms such as diarrhea, nausea, and vomiting if consumed. Ingesting the sap of the plant can also result in vomiting, and direct contact can cause burning sensations and skin irritation.


7. Flame Lily
Flame Lily, also known as the deadly garlic or Gloriosa superba L., belongs to the Colchicaceae family. First described in 1753 by Swedish botanist Carl Linnaeus, this plant is infamous for its potent toxicity. Every part of the Flame Lily contains deadly compounds that can prove fatal if ingested. After two hours of poisoning, the victim experiences nausea, vomiting, tingling and numbness around the mouth, sore throat, abdominal pain, and bloody diarrhea, leading to dehydration.
The toxins progress to cause muscle breakdown, intestinal obstruction, respiratory failure, low blood pressure, blood clotting disorders, hematuria, convulsions, coma, and neurological damage. In women, the poison can also cause skin peeling and vaginal bleeding. There has been a tragic case of Flame Lily poisoning leading to death in Hoa Vang, Da Nang, where a local mistakenly used the plant to make a medicinal drink, resulting in fatal consequences.


8. Hoa thiên điểu
Hoa thiên điểu tên khoa học là Strelitzia reginae mang nguồn gốc từ Nam Phi. Đây là loài hoa có vẻ đẹp hoang dại khiến ai cũng phải trầm trồ ngợi khen. Hoa thiên điểu thường rất bền và lâu tàn nên được sử dụng nhiều trong cắm hoa nghệ thuật. Hoa thiên điểu có hình dáng như chú chim đang sải cánh nên còn được gọi là "hoa chim thiên đường". Đây cũng là loại hoa mang ý nghĩa phong thuỷ, thường được dùng để trang trí lễ cưới, cắm trong lẵng hoa khai trương, trang trí dịp Tết.
BSCKII Huỳnh Tấn Vũ, Bệnh viện Đại học Y Dược TP.HCM (Cơ sở 3) cho biết, dù có vẻ đẹp mê lòng người nhưng hoa thiên điểu lại có chứa độc tố. Trong hoa và hạt của cây có chất gây ngộ độc đường ruột. Trên thế giới từng ghi nhận trường hợp tiếp xúc, hoặc ăn hoa, hạt ngộ độc với triệu chứng như buồn nôn, tiêu chảy, chóng mặt, bỏng rát lưỡi. Thậm chí nếu ngửi hoa lâu bạn sẽ bị khó chịu. Trung tâm kiểm soát chất độc động vật Mỹ (ASPCA) cũng khuyến cáo hoa thiên điểu không tốt cho thú nuôi như chó, mèo… Loại hoa này nằm trong danh sách những loại cây trồng có độc, khả năng gây hại tới thú nuôi.


9. Hydrangea
Hydrangea is a commonly grown ornamental flower. It is a perennial shrub with thick, opposite leaves that grow along the stem. The flowers form clusters at the tips of the branches and come in beautiful hues of pink, white, and purple. The plant typically blooms in the spring and summer.
The hydrangea's flowers and leaves contain cyanogenic glycosides, which can be toxic if ingested. Additionally, the pollen released by the flowers can cause skin allergies. Specifically, the leaves and roots contain hydragin-cyanogenic glycosides, and if consumed, they may cause symptoms such as vomiting and difficulty breathing. Without timely medical intervention, it could lead to coma, seizures, and circulatory issues. If you accidentally ingest any part of this plant, you should immediately seek medical assistance.


10. Lily flower
Lily flower is commonly found in Da Lat, and its scientific name is Angel’s trumpet. This flower is highly toxic. The toxin extracted from its leaves and petals can be used in medicine as a hallucinogen, but if consumed in excess, it can be fatal. The lily flower is classified as having high toxicity, so it is only used in medicine in very small amounts, measured in milligrams.
The flower contains the hallucinogenic substance scopolamine, and just one drop of its extract can affect the central nervous system. Victims can experience temporary memory loss and unconsciousness. In mild cases of poisoning, symptoms include dry mouth, difficulty swallowing, reduced secretion in the bronchi, and dilated pupils; in severe cases, victims may become confused, delusional, or easily agitated. When traveling, avoid letting the plant’s sap touch open wounds or come into contact with food and beverages. Children should not be allowed to handle the lily flower, as they might put it in their mouths.


