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Is Triangle Fern toxic to cats?

Pteridium aquilinum

Toxic to cats

Yes — triangle fern is toxic to cats according to the ASPCA. Keep it well away from any cat that chews plants; reactions can be significant. This classification follows the ASPCA Toxic and Non-Toxic Plant List. The ASPCA lists Bracken Fern (Pteridium aquilinum) as toxic to horses, with the toxic principle thiaminase causing thiamine deficiency — weakness, weight loss, staggers, tremors, and death. It also contains ptaquiloside, a known carcinogen. While the ASPCA page specifies horses, the plant is broadly hazardous to grazing livestock and is not a safe edible or pet/animal-accessible plant; keep it away from grazing animals and do not consume it.

What to do if your cat ate triangle fern

  1. Remove any plant material from your cat's mouth and move triangle fern out of reach.
  2. Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
  3. Do not induce vomiting unless a vet or poison-control specialist instructs you to.
  4. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
  5. Bring a leaf or photo of triangle fern to the appointment so it can be treated correctly.

General guidance, not veterinary advice. If you think your cat has eaten triangle fern, contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.

Is triangle fern toxic to cats? — FAQ

Is triangle fern toxic to cats?

Yes — triangle fern is toxic to cats according to the ASPCA. Keep it well away from any cat that chews plants; reactions can be significant. The ASPCA lists Bracken Fern (Pteridium aquilinum) as toxic to horses, with the toxic principle thiaminase causing thiamine deficiency — weakness, weight loss, staggers, tremors, and death. It also contains ptaquiloside, a known carcinogen. While the ASPCA page specifies horses, the plant is broadly hazardous to grazing livestock and is not a safe edible or pet/animal-accessible plant; keep it away from grazing animals and do not consume it.

What are the symptoms if a cat eats triangle fern?

The ASPCA lists Bracken Fern (Pteridium aquilinum) as toxic to horses, with the toxic principle thiaminase causing thiamine deficiency — weakness, weight loss, staggers, tremors, and death. It also contains ptaquiloside, a known carcinogen. While the ASPCA page specifies horses, the plant is broadly hazardous to grazing livestock and is not a safe edible or pet/animal-accessible plant; keep it away from grazing animals and do not consume it. Signs usually appear soon after chewing rather than hours later — watch for drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy after your cat has had access to triangle fern.

What should I do if my cat ate triangle fern?

Stay calm. Remove any plant from your cat's mouth and take the plant away. Note how much was eaten and when, and do not induce vomiting unless told to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice; a leaf or photo helps the vet treat it correctly.

Is triangle fern toxic to dogs too?

The ASPCA classification Growli uses applies to both cats and dogs: Triangle Fern is toxic to dogs as well. See the full triangle fern pet-safety guide for both species.

What is a cat-safe alternative to triangle fern?

For a similar look without the risk, see the best cats-safe plants list — every plant there is ASPCA non-toxic to cats and dogs.

Full triangle fern pet-safety