Is Sensitive Fern toxic to cats?

Mildly. The ASPCA lists sensitive fern as mildly toxic to cats — a chewing cat typically gets mouth irritation, drooling, and vomiting rather than a medical emergency, but it is still best kept out of reach. Onoclea sensibilis is not individually listed on the ASPCA Toxic and Non-Toxic Plants database, and the genus is not covered, so it cannot be labelled pet-safe. Some wild ferns contain compounds that are harmful to grazing animals, so treat with caution: keep away from pets and consult a vet if ingested, as effects in cats and dogs are not well characterised.

Onoclea sensibilis is not individually listed on the ASPCA Toxic and Non-Toxic Plants database, and the genus is not covered, so it cannot be labelled pet-safe. Some wild ferns contain compounds that are harmful to grazing animals, so treat with caution: keep away from pets and consult a vet if ingested, as effects in cats and dogs are not well characterised. 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 sensitive 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.

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

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.