Plant safety · 2 min read

Is Philodendron toxic to cats?

No — dangerous

Yes. Philodendron species contain calcium oxalate crystals causing mouth pain, drooling, and swelling — similar to pothos and peace lilies.

If your cat has just eaten philodendron

  1. Rinse the mouth with cool water if tolerated.
  2. Call your vet.
  3. Monitor for breathing difficulty.

What's the full picture?

Philodendrons (heart-leaf, split-leaf, and relatives) are popular UK houseplants that contain insoluble calcium oxalate crystals — microscopic needles that cause intense mouth pain on chewing.

Cats that chew a philodendron leaf will drop it quickly due to the burning sensation. The usual outcome is drooling, pawing at the mouth, and vomiting, but airway swelling is a rare and serious complication.

The calcium oxalate mechanism is shared with dieffenbachia, peace lilies, and monstera. If you have these plants, keep them out of cat-accessible areas or replace with safer options.

Symptoms to watch for

Immediately
Drooling, mouth pain, pawing.
Within hours
Swelling, reduced appetite.

If you're worried right now

Call your vet or out-of-hours emergency vet first. For poison advice, the Animal PoisonLine (UK) is on 01202 509000 — 24/7, charges apply. Your vet can also call the Veterinary Poisons Information Service (VPIS) directly.

Calla lilies no Dieffenbachia (dumb cane) no Ivy (English) no Monstera (Swiss cheese plant) no Peace lilies no Pothos (devil's ivy) no ZZ plants no

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

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