Yes, a peace lily is toxic to cats, but it is not the deadly kind of lily. The ASPCA lists the peace lily (Spathiphyllum) as toxic to cats and dogs because it contains insoluble calcium oxalate crystals, which cause mouth pain, drooling, vomiting and difficulty swallowing. It is not a true lily, and the Merck Veterinary Manual lists it as an "imposter" that does not cause the kidney failure true lilies do. If your cat has chewed one, call your vet, the ASPCA Animal Poison Control Center (888-426-4435) or the Pet Poison Helpline (855-764-7661) now.
If Your Cat Chewed a Peace Lily: What to Do Right Now
- Call now, before you read further. Phone your veterinarian, the nearest 24-hour emergency animal hospital, the ASPCA Animal Poison Control Center at 888-426-4435, or the Pet Poison Helpline at 855-764-7661. Both poison lines are open 24 hours a day and a fee may apply.
- Do not induce vomiting and do not attempt any home treatment unless a veterinarian or poison-control specialist tells you to for this plant, at this moment.
- If you are not completely sure the plant is a peace lily, say so on the phone. A true lily or a daylily in a cat is a time-critical emergency, and the specialist needs to know there is any doubt.
- Go to an emergency vet straight away if your cat has trouble breathing, a swollen face or tongue, or cannot swallow.
- Have the details ready: the plant (tag or photo), the part chewed, roughly how much, the time, and your cat's age, weight and health conditions.
Toxicity depends on the individual cat's size, age and health and on how much was involved. Only a veterinarian can judge your cat's situation. This page is general information, not a diagnosis.
Why a Peace Lily Is Not a True Lily
The name is the problem. "Lily" is a common name that gets attached to plants from unrelated groups, and for cats the group is what matters.
- True lilies belong to Lilium (Easter, Asiatic, Oriental, Stargazer, tiger lilies and others) and Hemerocallis (daylilies). The FDA calls these "very dangerous for cats" and states that the entire plant is toxic: stem, leaves, flowers, pollen and even the water in the vase.
- Peace lilies are Spathiphyllum, members of the Araceae family alongside monstera, philodendron, pothos and dieffenbachia. They are toxic, but in a different way.
The Merck Veterinary Manual is explicit on this point: "Only lilies within the Lilium and Hemerocallis families are considered true lilies and are toxic." It places peace lily (Spathiphyllum wallisii) on its list of common imposter lilies. Calla lily is another plant that carries the name without being a true lily; the Pet Poison Helpline groups calla lily with peace lily among insoluble oxalate plants.
For a deeper walk through the whole group, our guide to which lilies are toxic to cats and which are imposters sets the two categories side by side.
What a Peace Lily Actually Does to a Cat
A peace lily's toxic principle, according to the ASPCA, is insoluble calcium oxalate. The Merck Veterinary Manual describes these as needle-like crystals, called raphides, "found bundled in cells called idioblasts that are scattered throughout the plant." Chewing releases them into the mouth.
The ASPCA lists the clinical signs as oral irritation, intense burning and irritation of the mouth, tongue and lips, excessive drooling, vomiting and difficulty swallowing. The FDA describes peace and calla lilies as causing pawing at the face, drooling, foaming, vomiting and diarrhea. The Pet Poison Helpline adds that "in rare instances severe throat swelling resulting in breathing difficulty can occur."
The Merck Veterinary Manual states that insoluble oxalates "do not pose a concern for renal injury," and describes the prognosis for most exposures as good to excellent. That is a statement about most cases, not a guarantee about your cat, which is why the phone call still comes first.
The Real Danger: Mixed Bouquets and Mistaken Identity
The reason this page carries an emergency block at all is not the peace lily itself. It is the chance that the plant was not a peace lily, or not only a peace lily.
- Bouquets mix plants. A gift arrangement can contain true lilies next to other flowers, and loose pollen travels. Our guide to lily pollen on a cat's fur explains why a cat does not have to bite a true lily to be exposed.
- Labels go missing. A potted plant bought without a tag, or a cut stem in a vase, is easy to misname.
- "Lily" is used loosely. Someone in the household may call any white flower a lily.
The FDA gives true lilies a narrow time window: signs of kidney damage appear about 12 to 24 hours after ingestion, and "if treatment is delayed by 18 hours or more after ingestion, the cat will generally have irreversible kidney failure." That is why any doubt about the plant should be treated as a possible true lily until a specialist says otherwise. If there is any chance the plant was a true lily, our page on what to do when your cat ate a lily covers that emergency directly.
How to Tell a Peace Lily From a True Lily
This is for identifying what you own before an incident, not for deciding whether to call after one.
| Feature | Peace lily (Spathiphyllum) | True lily (Lilium, Hemerocallis) |
|---|---|---|
| Plant group | Araceae family | Lilium and Hemerocallis |
| Toxic principle for cats, per sources | Insoluble calcium oxalate crystals | A toxin the FDA says has not been identified |
| Main concern in cats | Mouth and throat irritation, vomiting | Acute kidney failure, including from pollen or vase water |
| Named as a true lily by Merck | No, listed as an imposter | Yes |
On the true lily toxin, the FDA's wording is direct: "The toxin, which only affects cats, has not been identified." The safest identification tool is the original plant tag or the florist's description. If you cannot confirm, describe the plant to the poison line.
Dieffenbachia: The Peace Lily's Close Relative
Dieffenbachia, often sold as dumb cane, sits in the same Araceae family and is frequently grouped with peace lily. The ASPCA lists it as toxic to cats and dogs, with the same clinical signs as peace lily: oral irritation, intense burning of the mouth, tongue and lips, excessive drooling, vomiting and difficulty swallowing.
One difference is worth knowing. The ASPCA names two toxic principles for dieffenbachia: insoluble calcium oxalates and a proteolytic enzyme. The peace lily entry names only the oxalates. That is one more reason to give the poison line the exact plant name rather than "some kind of houseplant", because the specialist works from the specific plant. Like peace lily, dieffenbachia is not a true lily, and the Merck Veterinary Manual groups it with the insoluble oxalate plants rather than with the lilies that damage kidneys.
Is Any Amount of Peace Lily Safe for a Cat?
This site does not publish safe amounts, and no responsible source can give one for your cat. The ASPCA lists peace lily as toxic without a threshold, the crystals act on contact, and a cat's reaction depends on how much was chewed and on the cat's size, age and health. Kittens, older cats and cats with health conditions may be affected differently from healthy adults.
The same applies to home remedies you may find elsewhere, such as rinsing the mouth or offering milk. The Merck Veterinary Manual describes mouth rinsing and calcium-containing dairy as part of veterinary care for oxalate exposure, but it is written for veterinarians with the patient in front of them. Ask the poison line before doing anything at home.
Living With a Peace Lily and a Cat
If you want to keep a peace lily, the question is reach and supervision.
- Keep the plant where your cat cannot climb to it, remembering that cats use nearby furniture as a launch point.
- Check leaves for bite marks and torn edges, which suggest your cat is already chewing.
- Keep the plant tag, or photograph it, so the correct name is ready in an emergency.
- Ask anyone sending flowers to leave true lilies and daylilies out of the arrangement.
- If your cat is persistent, move the plant to a room the cat cannot enter, or rehome it.
If your cat has chewed a different plant, our guide to what to do when your cat chewed a houseplant covers the first steps more broadly.
Sources Checked
We read the ASPCA Animal Poison Control Center's peace lily entry and the Merck Veterinary Manual's chapter on houseplants and ornamentals toxic to animals on September 27, 2026. We also read the FDA's guidance "Lovely Lilies and Curious Cats," the ASPCA's dieffenbachia entry and the Pet Poison Helpline's page on insoluble oxalates on the same date.
Frequently Asked Questions
Is peace lily toxic to cats in the same way as Easter lilies?
No. According to the Merck Veterinary Manual, only Lilium and Hemerocallis are true lilies with the kidney risk. Peace lily contains insoluble calcium oxalates, which the ASPCA links to mouth irritation, drooling, vomiting and trouble swallowing. It still warrants a call to your vet or a poison line.
Can peace lily pollen or vase water hurt my cat?
The FDA's warning about pollen and vase water causing kidney failure is about true lilies. For peace lily, call the poison line and describe the exposure, and mention any other flowers that were in the same arrangement.
My cat is drooling after biting a peace lily. What should I do?
Call your vet, the ASPCA Animal Poison Control Center at 888-426-4435, or the Pet Poison Helpline at 855-764-7661 now. Do not attempt home treatment unless they instruct you to. Go to an emergency vet immediately if there is any breathing difficulty.
Is dieffenbachia worse than peace lily for cats?
The ASPCA lists both as toxic with the same signs, but names a proteolytic enzyme in dieffenbachia in addition to the oxalates. Only a vet can judge how either plant affects your particular cat.
Is peace lily toxic to dogs?
Yes. The ASPCA lists peace lily as toxic to both dogs and cats.
This article is general information and does not replace veterinary care. If you think your cat has chewed any plant or been near any lily, contact your veterinarian, the ASPCA Animal Poison Control Center at 888-426-4435, or the Pet Poison Helpline at 855-764-7661. Only a veterinarian can assess your individual cat.