Are Calla lilies toxic to cats?
Calla lilies are not true lilies. They contain calcium oxalate crystals causing painful mouth irritation, drooling, and swelling — unpleasant but rarely fatal.
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Key facts
- Verdict: No — dangerous to cats. Calla lilies should never be given deliberately.
- Category: Lily
- Onset: Signs can start immediately — see the full timeline below.
- If it's already happened: Call your vet now, or the Animal PoisonLine on 01202 509000 (24/7, charges apply) — see the emergency steps below.
If your cat has just eaten calla lilies
- Rinse your cat's mouth gently with cool water if tolerated.
- Call your vet for advice and possibly pain relief.
- Monitor breathing — rapid or laboured breathing may indicate throat swelling.
What's the full picture?
Calla lilies (Zantedeschia species) are the elegant, trumpet-shaped white or coloured flowers commonly seen in wedding bouquets, florist arrangements, and as garden or pot plants. Despite the common name, they belong to the Araceae family — the same family as peace lilies, philodendron, and monstera — rather than the true lily family Liliaceae. This distinction matters medically: true lilies (Lilium and Hemerocallis species) cause acute kidney failure in cats from even minimal ingestion, while calla lilies do not carry that renal risk at all.
The danger with calla lilies comes from insoluble calcium oxalate crystals, bundled into needle-like structures called raphides, present throughout the leaves, stems, and flowers. When a cat bites into any part of the plant, these microscopic crystals are mechanically forced into the soft tissue of the mouth and tongue, causing near-immediate pain along with the release of other irritant compounds. It's a physical injury response rather than a systemic poison, which is why the mouth and throat problems appear so fast — usually within minutes of biting the plant.
In a typical UK household, exposure happens through cut flowers brought home from a florist or supermarket, wedding or event displays left within reach, or garden-grown Zantedeschia aethiopica planted in a border a curious cat can nibble. Cats are often deterred quickly by the pain, so most ingestions are small — a bite or two rather than a mouthful — which limits how much crystal exposure actually occurs. Vases of cut calla lilies on a table or windowsill are the most common route, since the water they sit in can also carry a low concentration of irritant compounds.
Most cases resolve with supportive care over a day or two: pain relief, sometimes an anti-inflammatory, and monitoring for eating and drinking to return to normal. Serious complications are uncommon but not impossible — extensive chewing can occasionally cause enough throat swelling to affect breathing, which is why any laboured breathing or persistent drooling after exposure warrants a vet call rather than a wait-and-see approach.
Symptoms to watch for
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Cat owner essentials
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Questions owners ask
Are calla lilies as dangerous as true lilies?
No. True lilies (Lilium and Hemerocallis species — Easter, tiger, day lilies) can cause fatal kidney failure from a tiny amount. Calla lilies cause painful but rarely life-threatening mouth and throat irritation instead.
My cat just chewed a leaf but seems fine — do I need a vet?
If they're only drooling a little and otherwise acting normally, you can monitor at home and offer water. Call your vet if drooling is heavy, they're pawing at their mouth persistently, or you notice any swelling or breathing changes.
Are calla lily bulbs more toxic than the leaves?
Bulbs and rhizomes tend to have a higher concentration of calcium oxalate crystals than the leaves, so digging up and chewing a planted bulb is likely to cause a stronger reaction than nibbling a leaf tip.
Can I keep calla lilies at home if I have a cat?
Many owners do without issue, especially if the plant is kept somewhere the cat can't easily reach, such as a high shelf or a room the cat doesn't use. If your cat is a persistent plant-chewer, it's safer to choose a non-toxic alternative.
If your cat keeps returning to the wrong plant, a pet-safe plant deterrent spray can break the habit without harm.
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Related
Sources referenced for this guidance
- Veterinary Poisons Information Service (VPIS) — UK clinical toxicology reference used by vets
- International Cat Care — feline-specific clinical guidance
- BSAVA — British Small Animal Veterinary Association reference materials
- Merck Veterinary Manual — professional veterinary reference
About this guidance
Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.
This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.
Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.
Last reviewed: · By the What Can My Cat Eat? editorial team