A list of poisonous and dangerous flowers to watch out for

24 Feb. 2569

Flowers can brighten up your home and are a popular gift for any occasion. However, many people don’t realize that some flowers are toxic or potentially dangerous—especially for young children and pets such as cats and dogs.

This article compiles a list of flowers to watch out for, possible symptoms, prevention tips, and safer alternatives—so you can choose flowers with greater confidence.

Note: This content is for general informational purposes only and is not intended as medical or veterinary advice. If severe symptoms occur, seek immediate care from a doctor or veterinarian.

What Are Toxic Flowers? How Dangerous Are They?

Toxic flowers are flowers or plants that contain certain substances that can cause harm when ingested or touched. The severity depends on the type of flower, the amount of exposure, and each person’s/pet’s sensitivity.

Common Symptoms of Flower Poisoning

Skin irritation, itching, redness, or rash
Burning sensation in the mouth, numbness, excessive drooling (common in pets)
Nausea, vomiting, stomach pain, diarrhea
Lethargy, weakness, or abnormal breathing (in severe cases)

Note: If you suspect someone—or a pet—has eaten or bitten a toxic flower and shows unusual symptoms, seek medical or veterinary help immediately.

Common Toxic Flowers Found in Thailand and Worldwide

If you’re wondering which flowers are toxic, below are some of the most common types found in homes and gardens—along with a few that are also popular in floral arrangements.

1. Lily — Extremely Dangerous for Cats

Lilies are beautiful and very popular, but they’re high-risk for households with cats. Cats are especially sensitive to substances in lilies—even licking pollen or chewing a small part of a leaf can cause severe symptoms.อันตรายต่อ: คน เด็ก สุนัข แมว

Risk to: people, children, dogs, cats

High-risk parts: leaves / petals / stem / even the water in the vase

Possible symptoms:

Cats: vomiting, lethargy, loss of appetite, reduced urination
Dogs: vomiting, diarrhea
People: itching, eye irritation

Recommendation: If you have cats at home, avoid lilies entirely. If you suspect your cat has come into contact with, licked, or chewed any part of the plant, see a veterinarian immediately and bring a photo or sample of the flower.

2. Oleander — Toxic in Every Part of the Plant

Oleander is commonly found in home gardens and along roadsides. Many parts of the plant are poisonous, and accidental ingestion by children or pets can cause serious symptoms.

Risk to: people, children, dogs, cats

High-risk parts: the entire plant (flowers, leaves, stems)

Possible symptoms: nausea, vomiting, dizziness, abnormal heart-related symptoms

Recommendation: Avoid planting oleander in homes with young children or pets.

3. Hydrangea

Hydrangeas are a popular choice for decoration, but parts of the plant contain substances that can irritate the digestive tract, especially if ingested.

Risk to: people, children, dogs, cats

High-risk parts: leaves and flowers

Possible symptoms: mouth irritation, drooling, vomiting, diarrhea

Recommendation: If displaying hydrangeas at home, keep them out of reach of children and pets.

4. Tulip — Watch Out for the “Bulb”

Tulips can cause irritation, especially the underground bulb, which tends to contain a higher concentration of the irritating compounds. If pets chew on it, they may drool or vomit.

Risk to: dogs, cats, and young children who tend to put things in their mouths

High-risk part: the tulip bulb (often more concentrated than other parts)

Possible symptoms: mouth irritation, drooling, vomiting

Recommendation: Avoid leaving tulip bulbs or cut leaves/stems where pets can reach them.

5. Daffodil

Daffodils can also be risky—especially the underground bulb. If ingested, they may cause nausea, vomiting, or diarrhea. If you grow them in pots, place them where children and pets can’t easily reach.

Risk to: people, children, dogs, cats

High-risk parts: the bulb (highest risk); leaves/flowers can also be risky

Possible symptoms: nausea, vomiting, stomach pain, diarrhea, weakness

Recommendation: Take extra care when planting or repotting. Store bulbs securely, and if ingestion is suspected, seek professional medical/veterinary help immediately.

6. Foxglove — Heart-Related Risk

Foxglove contains compounds that can affect the heart, especially in severe cases. It’s best avoided in homes with young children, and it’s not recommended for planting or displaying in easily accessible areas.

Risk to: people, children, dogs, cats

High-risk parts: multiple parts of the plant (leaves / flowers / stems)

Possible symptoms: nausea, vomiting, dizziness, palpitations/irregular heartbeat (in severe cases)

Recommendation: Avoid foxglove in homes with children or pets. If ingestion is suspected, seek immediate medical or veterinary care.

7. Calla Lily / Certain Aroid Plants

Plants in this group can cause mouth irritation, drooling, or swelling of the mouth when chewed. Homes with playful pets that like to bite or chew things should avoid them.

Risk to: young children, dogs, cats

High-risk parts: leaves, stems, flowers (sap/irritating compounds)

Possible symptoms: burning sensation in the mouth, drooling, swollen lips/tongue, vomiting (in some cases)

Recommendation: Not suitable for homes with pets that chew. Keep out of reach/out of their path, or choose safer flowers instead.

Toxic Flowers and Safety for Children and Pets: What to Watch Out For

Young children and pets are more likely to put things in their mouths or chew on plants without realizing the danger, which makes their risk higher than adults.

Warning Signs—Seek Medical/Veterinary Care Immediately

Persistent vomiting or severe diarrhea
Unusual lethargy or not responding normally
Difficulty breathing / pale gums (in pets)
Swollen mouth or tongue, or signs of a severe allergic reaction

What Should You Do If Someone Accidentally Eats a Toxic Flower?

Remove any remaining petals/leaves from the mouth (only if it’s safe to do so)
Rinse the mouth with clean water (do not force swallowing)
Take a photo or keep a sample of the plant (helps with faster identification and diagnosis)
Do not try to induce vomiting unless instructed by a medical professional or veterinarian
Go to a hospital or veterinary clinic promptly if any abnormal symptoms appear

How to Choose Safer Flowers (Peace of Mind for Homes with Children or Pets)

Tips for Choosing and Placing Flowers Safely

Choose flowers known to be pet-/child-safe or low-risk
Place bouquets out of children’s reach and away from where pets can access them
Clean up fallen leaves/pollen and change the vase water regularly
If you’re sending flowers as a gift, ask whether the recipient has pets or young children at home

Safer Flower Alternatives (Great for Gifting)

Roses
Gerberas
Orchids
Sunflowers
Chrysanthemums (some households may still want to watch for individual allergies)

Flowers can truly bring warmth and joy—but for safety, it’s worth remembering that some varieties are toxic and may be harmful to young children or pets. Choosing the right types, placing them safely, and opting for low-risk alternatives can help you give flowers bouquet with greater peace of mind.

FAQ: Frequently Asked Questions About Toxic Flowers

Are all toxic flowers equally dangerous?

No. Some are only harmful if ingested, while others can cause irritation through simple contact. Certain flowers can be extremely dangerous to specific types of pets.