# Are Ferns Toxic to Cats? Holly, Staghorn and More Is holly fern toxic to cats? No. The ASPCA Animal Poison Control Center lists holly fern (Cyrtomium falcatum) as non-toxic to cats and dogs [1][2]. Most true ferns are safe, but a few plants that look like ferns, and one common "palm" that many people mistake for a fern, can make your cat very sick. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Holly fern, Japanese holly fern, and fishtail fern are all the same plant, Cyrtomium falcatum, and all are non-toxic to cats [1][2]. - Common staghorn fern (Platycerium bifurcatum) is also listed as non-toxic to cats, dogs, and horses [3]. - Most true ferns, including Boston fern, tree fern, and frosty fern, are considered safe houseplants for cats. - Sago palm is not a fern. It is highly toxic to cats and is the plant most often confused with ferns in poisoning calls. - If your cat ate fern leaves, remove the plant, watch for vomiting or drooling, and call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 if signs appear. ## Is Holly Fern Toxic to Cats? No. Holly fern is non-toxic to cats [1][2]. The ASPCA lists it under two names, holly fern and Japanese holly fern, with the scientific name Cyrtomium falcatum and the additional common name fishtail fern [1][2]. Both records state "Non-Toxic to Dogs, Non-Toxic to Cats" and list the toxic principle as non-toxic [1][2]. That means there is no known poison in this plant that harms cats. If your cat nibbles a frond, you do not need to panic. You also do not need to rush to an emergency clinic just because the plant was chewed. Holly fern belongs to the family Polypodaceae, the same broad group as many other common ferns [1][2]. Its glossy, holly-like leaflets are what give it the name, and those leaflets are the part cats usually bat at or bite. ### What About the Other Ferns in Your House? Owners ask about several ferns by name. Here is how they sort out. **Staghorn fern.** Common staghorn fern (Platycerium bifurcatum) is listed as non-toxic to dogs, cats, and horses [3]. This is the big, antler-shaped fern people mount on boards. It is safe. **Boston fern.** Boston fern is a true fern and is widely grown as a hanging or floor plant. It is not listed as toxic, and it is generally considered a safe choice in a cat household. If your cat chews the fronds, expect a possible upset stomach from the plant fiber, not poisoning. **Tree fern.** Tree ferns are true ferns with tall, trunk-like stems. They are not on toxic plant lists and are considered safe around cats. **Frosty fern.** Frosty fern (often sold as Selaginella) is not a true fern at all, it is a spikemoss. It is not listed as toxic to cats and is generally treated as a safe plant. The white tips that give it the "frosty" look are not a poison. **Bracken fern.** This is the exception. Bracken fern (Pteridium species) is a genuinely toxic plant, but it grows outdoors in pastures and woodland, not in living rooms. In cattle, bracken fern consumption is linked to upper digestive tract cancers and to bleeding disorders [4][5]. It is not a houseplant, and it is not the fern you bought at the garden center. **Sago palm.** Sago palm is not a fern, despite the feathery fronds. It is a cycad, and it is one of the most dangerous plants a cat can chew. This is the plant behind many severe cat poisonings, and it is the main reason "is this fern toxic" questions matter. If you want a broader list of dangerous plants, see [Plants Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/plants-toxic-to-cats) and [House Plants Toxic To Cat](/knowledge/veterinary-medicine/toxicology-and-food-safety/house-plants-toxic-to-cat). ## The Toxic Principle and What It Does in the Body For holly fern and staghorn fern, there is no toxic principle [1][3][2]. The ASPCA records list the toxic principle as non-toxic [1][2]. Nothing in the plant is known to damage a cat's organs. So what happens if a cat eats a leaf? Usually nothing beyond mild stomach upset. Plant fiber can irritate the stomach lining, and a cat may vomit once or have a loose stool. That is a mechanical effect, not poisoning. The real danger comes from plants that get mistaken for ferns. **Sago palm** contains cycasin, a toxin that attacks the liver and the gut. Cats that eat even a small amount can develop severe liver failure. Signs often start within hours and can worsen over a day or two. **Bracken fern** contains ptaquiloside, a compound linked to bleeding and to cancer in livestock that graze on it [4][5]. The same plant family also contains compounds that damage red blood cells in ruminants [5]. These are large-animal pasture problems, not typical household exposures, but they explain why "fern" and "toxic" appear together in search results. **Ericaceae plants** such as rhododendron and Pieris japonica contain grayanotoxins, which cause vomiting, retching, and regurgitation in animals that eat them [6]. These are shrubs, not ferns, but their leaves can look leathery and fern-like to an owner trying to identify a plant after a cat chews it [6]. The pattern is simple. True ferns are safe. Look-alikes and mislabeled plants are where the risk lives. ## Signs to Watch For and When They Appear If your cat ate holly fern, staghorn fern, Boston fern, tree fern, or frosty fern, you may see no signs at all. That is the most common outcome. If signs do appear, they are usually mild and start within a few hours: - One or two episodes of vomiting - Drooling - Lip smacking or pawing at the mouth - Mild loss of appetite - Soft stool These signs come from eating plant material, not from a poison. Signs that point to a serious plant poisoning are different. Watch for: - Repeated vomiting that will not stop - Vomiting that contains blood - Weakness, wobbling, or collapse - Yellow tint to the gums, skin, or whites of the eyes - Dark urine or a sudden drop in urine - Drooling with tremors or seizures - Refusing all food and water for more than a day Grayanotoxin poisoning in animals commonly causes retching, regurgitation, and vomiting [6]. Liver toxins like the ones in sago palm cause vomiting, lethargy, and jaundice that worsen over hours to days. Timing matters. Mild stomach upset from chewing a safe fern usually shows up within a few hours and settles within a day. Signs from a liver toxin often appear within 6 to 12 hours and get worse. If your cat is getting worse instead of better, treat it as an emergency. ## What to Do Right Now If Your Cat Ate Fern Leaves First, identify the plant. Take a photo, or bring a cutting or the plant tag with you. Fern identification is much easier with a leaf in hand. Second, remove your cat from the plant and put the plant out of reach. Third, call for advice. You have three good options: - Your own veterinarian or the nearest emergency veterinary clinic - ASPCA Animal Poison Control Center at (888) 426-4435 - Pet Poison Helpline at (855) 764-7661 Both poison control lines are staffed around the clock. A consultation fee may apply for the ASPCA line [1]. Do not induce vomiting unless a veterinarian tells you to. Vomiting can cause harm if the plant is irritating to the mouth or throat, and it is not needed for a non-toxic fern. Do not give milk, oil, activated charcoal, or any home remedy. Do not wait to see if signs develop before calling if you know the plant was a sago palm. Call right away. If your cat is vomiting, drooling heavily, wobbly, or unresponsive, go to an emergency clinic now. Do not wait for a callback. For a wider look at which plants cause problems, see [What Plants Can Be Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-can-be-toxic-to-cats) and [Flowers That Are Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/flowers-that-are-toxic-to-cats). ## Veterinary Treatment Treatment depends on what your cat actually ate and how sick it is. For a confirmed non-toxic fern with mild signs, your veterinarian may simply recommend monitoring at home. Some cats get a single dose of an anti-nausea medication or a bland diet for a day. Your veterinarian calculates any medication dose from your cat's weight and health, so never use a leftover pill from a previous visit. For a suspected toxic plant, the visit looks different. Your veterinarian will ask what plant, which part, how much, and when. They will examine your cat, check gum color, and often run blood work to look at liver values, kidney values, and red blood cell counts. A liver toxin can show up on blood work before your cat looks very sick, which is why early testing matters. Treatment may include intravenous fluids, medications to control vomiting, liver-supporting drugs, and repeated blood work to track organ function. Some cats need hospitalization for a day or more. Activated charcoal may be used in some cases, but only under veterinary direction. If you are not sure what the plant was, bring it. A positive identification changes the whole plan. A safe fern means a short visit. A sago palm means aggressive treatment started immediately. ## Outlook For holly fern, staghorn fern, and other true ferns, the outlook is excellent. These plants are non-toxic to cats, and most cats that chew them recover fully with no treatment at all [1][3][2]. For toxic look-alikes, the outlook depends on how fast treatment starts. Cats that reach a veterinarian within the first few hours do far better than cats that arrive a day later. Liver damage from sago palm can be permanent or fatal, and the damage often continues even after the plant is gone. The single best thing you can do is call early. A phone call costs nothing and can save a life. ## Prevention and Safer Alternatives The easiest prevention is to keep toxic plants out of the house entirely. Check every new plant against a reliable toxic plant list before you bring it home. If you love ferns, you have plenty of safe options. Holly fern, staghorn fern, Boston fern, tree fern, and frosty fern are all reasonable choices for a cat household [1][3][2]. Hang them, mount them, or place them on a shelf your cat cannot reach. Even safe plants can cause a messy stomach upset if a cat eats a lot of leaves. Give your cat its own plants. Cat grass, wheatgrass, and catnip satisfy the urge to chew and keep attention away from your houseplants. Place a pot near your cat's favorite window. Use barriers. Citrus scent, double-sided tape, or a simple wire cloche can keep cats off plant shelves. Make sure pots are stable so a curious cat cannot tip them over. Know the dangerous look-alikes. Sago palm, bracken fern, rhododendron, and Pieris japonica are the plants most likely to be confused with ferns or with other common greenery[6]. If you have any of these, rehome them or keep them completely out of reach. Keep the poison control numbers where you can find them fast. Save (888) 426-4435 and (855) 764-7661 in your phone. For more on safe and unsafe choices, see [What Plants And Flowers Are Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-and-flowers-are-toxic-to-cats). ## Limitations and When to Contact a Veterinarian This article covers common ferns and the plants most often confused with them. It cannot tell you what your individual cat ate or how that cat will respond. Individual cases need a veterinarian who can examine your cat and, when needed, run blood work. Contact your veterinarian the same day if: - Your cat vomited more than once after chewing a plant - Your cat is drooling, pawing at the mouth, or refusing food - You are not sure what plant your cat ate - Your cat has a known liver or kidney condition Go to an emergency clinic now if: - Your cat is weak, wobbly, or collapsed - Your cat is having trouble breathing - Your cat's gums look pale, yellow, or blue - Your cat is having seizures or tremors - You know or suspect your cat ate sago palm Call for a routine visit if your cat chewed a safe fern, seems fine, and you simply want reassurance or a plant identification check. ## Frequently Asked Questions ### Is staghorn fern toxic to cats? No. Common staghorn fern (Platycerium bifurcatum) is listed as non-toxic to cats, dogs, and horses [3]. You can keep it in a cat household without worrying about poisoning. A cat that eats a lot of the fronds may still vomit from the plant fiber. ### Is tree fern toxic to cats? No. Tree ferns are true ferns and are not listed as toxic to cats. They are generally considered safe houseplants. As with any plant, a large amount of chewed frond can cause mild stomach upset. ### Is frosty fern toxic to cats? No. Frosty fern is not listed as toxic to cats and is generally treated as a safe plant. It is actually a spikemoss, not a true fern, but that does not change the safety answer. Keep it out of reach anyway if your cat likes to dig in potting soil. ### Are Boston ferns safe for cats? Yes. Boston fern is a true fern and is considered safe for cats. It is one of the better choices for a home with cats because it is not on toxic plant lists. Hanging it high prevents most chewing and keeps the fronds looking full. ### My cat ate fern leaves. Should I worry? It depends on which fern. If it was holly fern, staghorn fern, Boston fern, tree fern, or frosty fern, the risk of poisoning is very low [1][3][2]. Watch for vomiting or drooling, and call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 if signs appear or if you cannot identify the plant. ## Related Articles - [Plants Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/plants-toxic-to-cats) - [What Plants Can Be Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-can-be-toxic-to-cats) - [Flowers That Are Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/flowers-that-are-toxic-to-cats) - [What Plants And Flowers Are Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-and-flowers-are-toxic-to-cats) - [House Plants Toxic To Cat](/knowledge/veterinary-medicine/toxicology-and-food-safety/house-plants-toxic-to-cat) - [What Plants Are Toxic To Cats Indoor](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-are-toxic-to-cats-indoor) - [Are Boston Ferns Toxic to Cats? Safe or Not?](/knowledge/veterinary-medicine/toxicology-and-food-safety/boston-ferns-toxic-cats) - [Is Button Fern Toxic to Cats? Safety Information](/knowledge/veterinary-medicine/toxicology-and-food-safety/button-fern-toxic-cats) - [Are Maidenhair and Foxtail Ferns Toxic to Cats?](/knowledge/veterinary-medicine/toxicology-and-food-safety/maidenhair-foxtail-fern-toxic-cats) ## References 1. [Toxic and Non-toxic Plants: Holly Fern](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/holly-fern). ASPCA Animal Poison Control Center. 2. [Toxic and Non-toxic Plants: Japanese Holly Fern](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/japanese-holly-fern). ASPCA Animal Poison Control Center. 3. [Toxic and Non-toxic Plants: Common Staghorn Fern](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/common-staghorn-fern). ASPCA Animal Poison Control Center. 4. [Bovine upper alimentary squamous cell carcinoma associated with bracken fern poisoning: Clinical-pathological aspects and etiopathogenesis of 100 cases](https://pubmed.ncbi.nlm.nih.gov/30256853/). PloS one, 2018. 5. [Anaemia in Ruminants Caused by Plant Consumption](https://pubmed.ncbi.nlm.nih.gov/36139233/). Animals : an open access journal from MDPI, 2022. 6. [Grayanotoxin poisoning in animals following the ingestion of Ericaceae plants](https://pubmed.ncbi.nlm.nih.gov/41544885/). Veterinary journal (London, England : 1997), 2026. ## Further Reading - [ASPCA: Toxic and Non-Toxic Plants List](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants) - [ASPCA Animal Poison Control Center](https://www.aspca.org/pet-care/animal-poison-control) - [ASPCA: People Foods to Avoid Feeding Your Pets](https://www.aspca.org/pet-care/aspca-poison-control/people-foods-avoid-feeding-your-pets)