Is heartleaf philodendron toxic to cats?
Philodendron hederaceum
Yes. Heartleaf philodendron is toxic to cats, graded low severity by NC State Extension. The agent is insoluble calcium oxalates. Call your vet if a cat has eaten any.
- Take any remaining plant material out of their mouth and rinse the mouth with water.
- Call someone. Your own vet first. Otherwise ASPCA Animal Poison Control on (888) 426-4435 or the Pet Poison Helpline on (855) 764-7661 — both charge a fee.
- Take a photo of the plant, and note roughly how much was eaten and when. It is the first thing you will be asked.
- Do not make your cat vomit unless a vet tells you to.
What it does, and why
The agent is insoluble calcium oxalates.
Needle-shaped crystals called raphides sit under pressure in the plant tissue. Chewing fires them into the lining of the mouth and tongue, where they embed mechanically.
Pain is immediate rather than delayed, which is why most animals stop after one bite. That self-limiting bite is the reason these cases usually stay mild.
Worth watching for. The uncommon serious case is swelling that affects breathing or swallowing.
Reported signs
- oral irritation
- intense burning of mouth and tongue
- excessive drooling
- vomiting
- difficulty swallowing
Signs as listed by the ASPCA under Philodendron hederaceum. Not every animal shows all of them.
What each authority says
- ASPCA
- Toxic to cats and dogs · insoluble calcium oxalates
- NC State Extension
- Poison severity: Low · Calcium oxalate crystals · Oral irritation, pain and swelling of mouth, tongue and lips, excessive drooling, vomiting, and difficulty swallowing
What to keep instead
Species in this database listed non-toxic to cats and dogs, chosen for a similar look or similar care rather than at random.
| Plant | Family | Water | Difficulty |
|---|---|---|---|
| Chinese money plantPilea peperomioides | Urticaceae | 6–11d | 2/5 |
| Wax plantHoya carnosa | Apocynaceae | 10–18d | 2/5 |
| Baby rubber plantPeperomia obtusifolia | Piperaceae | 9–14d | 1/5 |
Swapping the plant is the only measure that reliably works. Height and hanging baskets buy less time than people expect with a determined cat.
The other animal
Looking for dogs? See is heartleaf philodendron toxic to dogs. Full care details are on the heartleaf philodendron species entry.
Sources
- ASPCA Animal Poison Control — Philodendron hederaceum Checked 2026-09-11.
- North Carolina Extension Gardener Plant Toolbox — Philodendron hederaceum Checked 2026-09-11.
- Royal Botanic Gardens Kew, Plants of the World Online — Philodendron hederaceum Accepted name and family. Checked 2026-09-11.
- ASPCA Animal Poison Control Center, (888) 426-4435 — emergency line, fee applies
Compiled and edited by Tony Valcarcel · 2026-09-11
Tony Valcarcel is the editor and publisher of this database, not a veterinarian.
Severity is reproduced from the authority that published it and is never
originated here. How this is sourced.
This page is a reference, not a diagnosis. In an emergency, call rather than read.