No, ferns are not toxic to cats
Most true ferns, including Boston, maidenhair and bird's nest ferns, are non-toxic to cats and dogs (ASPCA). The big exception is asparagus fern, which is not a true fern: its berries cause vomiting and repeated skin contact causes dermatitis.
Ferns and cats: key facts
| Toxic to cats? | Non-toxic |
| Toxic to dogs? | Non-toxic |
| Scientific name | Nephrolepis exaltata (Boston fern) and others |
| Also called | Boston fern, sword fern, maidenhair fern, bird's nest fern |
| Toxic compound | None known |
| Toxic parts | True ferns are not toxic. Asparagus fern is toxic |
| Plant type | Houseplant |
What happens if a cat eats ferns?
- Mild stomach upset if a lot is eaten
Why ferns are considered safe
Ferns are not known to contain compounds that are poisonous to cats. That does not mean cats should eat them: cats cannot digest large amounts of plant fiber, so eating a lot of any plant can cause a short bout of vomiting or diarrhea.
What to do if your cat ate ferns
- Remove any remaining plant material from your cat's mouth and move the plant out of reach.
- Offer fresh water. Mild vomiting from plant fiber usually settles within a few hours.
- Check the pot: fertilizer sticks, systemic pesticides, slug bait and cocoa mulch can be more dangerous than the plant itself.
- Call your vet if vomiting or diarrhea lasts more than 24 hours, or if your cat seems lethargic.
When treatment is needed
Treatment is rarely needed. If vomiting or diarrhea lasts more than a day, or your pet seems unwell, call your vet, as something else may be going on (for example fertilizer, pesticide or a swallowed piece of pot).
How to keep your cat away from ferns
- Place ferns on high shelves or in hanging planters away from furniture cats can climb, or in a room your cat cannot enter.
- Give your cat something better to chew: a pot of cat grass or catnip often distracts cats from houseplants.
- Pick up fallen leaves, petals and pollen promptly, and empty vases where pets can reach them.
Ferns and cats: FAQ
Are ferns poisonous to cats?
Ferns are non-toxic to cats, according to the ASPCA. Eating a lot of any plant can still cause mild stomach upset.
Can I keep ferns in a house with cats?
Yes. Ferns are considered pet-safe. Keep them where your cat cannot knock them over or dig in the soil, and avoid pesticide or fertilizer products pets could lick.
Are ferns toxic to dogs too?
No. Ferns are also non-toxic to dogs (ASPCA).
Is asparagus fern toxic to cats and dogs?
Yes. Asparagus fern (Asparagus densiflorus) is not a true fern. Its berries can cause vomiting and diarrhea, and its sap can cause skin irritation.
Other plants toxic to cats
- LiliesHighly toxic
- AzaleasHighly toxic
- OleanderHighly toxic
- Sago PalmsHighly toxic
- FoxgloveHighly toxic
- Lily of the ValleyHighly toxic
- YewHighly toxic
- Autumn CrocusHighly toxic
Sources
- ASPCA Animal Poison Control: Toxic and Non-Toxic Plants for Cats
- Merck Veterinary Manual: Poisonous Plants
Toxicity ratings follow the ASPCA Animal Poison Control Center plant lists. Severity depends on the amount eaten, the part of the plant and your cat's size and health. When in doubt, call your vet.