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Is American Holly toxic to cats?

YES (TOXIC)
Unfortunately, American Holly is toxic and potentially harmful to cats. We recommend you keep your feline friends away from this plant. See the table below for more information.
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Additional Names:English Holly, European Holly, Oregon Holly, Inkberry, Winterberry
Scientific Name:Ilex opaca
Family:Aquifoliaceae
Toxic Principles:saponins
Clinical Signs:Vomiting (not in horses), diarrhea and depression.
If you think your cat may have ingested a poisonous substance, call 888 426 4435 or your local vet
Detailed Write-up
Author:
Alec
Last Updated:
7/13/25

Is American Holly Toxic to Cats?

Cats are lovely creatures that love to explore and play. They often find themselves in situations that raise concerns among their owners. One such situation is when they come in contact with plants. As a responsible pet owner, it is essential to know which plants are safe for your cat and which ones are not. One of the plants that have been in the limelight regarding this matter is the American Holly.

What is American Holly?

American Holly, also known by its scientific name Ilex opaca, is a species of holly native to the eastern and southern regions of North America. It is an evergreen tree that can grow up to 15 to 50 feet tall. American Holly features dark green and glossy leaves with sharp spines on the edges. They produce red berries during the fall that attract birds and small animals, including cats.

Why do Cats come in Contact with American Holly?

Cats are curious creatures, and they often explore their surroundings. American Holly is one of many plants that cats might encounter while exploring the outdoors. Cats might also come in contact with berries or other plant parts brought indoors by humans as decoration during the holiday season.

Is American Holly Toxic to Cats?

Yes, American Holly is toxic to cats. All parts of the plant, including the leaves, branches, and berries, contain saponins and methylxanthines, which are toxic to cats. When cats ingest any part of American Holly, they might experience gastrointestinal problems such as vomiting, diarrhea, and abdominal pain. In severe cases, cats might experience tremors and seizures.

What should you do if your Cat Ingests American Holly?

If you suspect that your cat has ingested American Holly, you should take them to a veterinarian immediately. Your vet might induce vomiting to remove the plant material from the cat's gastrointestinal system and provide supportive care if the cat experiences any symptoms.

Preventing your Cat from Coming in Contact with American Holly

The best way to protect your cat from American Holly toxicity is by preventing them from coming in contact with the plant. If you have American Holly on your property, make sure you prevent your cat from accessing the area. You can also remove the plant from your yard and replace it with cat-safe plants. During the holiday season, avoid using American Holly as decoration, or keep it out of reach of your cat.

Other Cat-toxic Plants

American Holly is just one of the many plants that can be toxic to cats. Other plants to watch out for include:

  • Aloe Vera
  • Asparagus Fern
  • Azaleas
  • Chrysanthemums
  • English Ivy
  • Lilies
  • Poinsettias

It is important to research any plants that you bring into your home or yard to ensure that they are safe for your cat. Consult with your veterinarian before introducing any new plant to your cat's environment.

Conclusion

American Holly is poisonous to cats. All parts of the plant, including berries, contain saponins and methylxanthines, which can cause various gastrointestinal problems. Cat owners need to be aware of any toxic plants in their environment to prevent accidental ingestion. If you suspect that your cat has ingested any toxic material, take them to a veterinarian immediately. Remember, prevention is always better than cure, and it is better to remove any toxic plants from your environment than to take the chance of your cat ingesting them.

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