Is Monstera toxic to cats?
Monstera (Monstera deliciosa) is toxic to cats. The agent is insoluble calcium oxalates.
ASPCA Animal Poison Control, 24 hours: (888) 426-4435 (a consultation fee may apply), or call your own vet. Take a piece of the plant with you.
Signs that need a vet the same day whatever the plant: repeated vomiting, drooling that will not stop, swelling of the mouth or face, trouble breathing or swallowing, collapse, or a seizure.
What it does, and why
Monstera contains insoluble calcium oxalates. These are microscopic needle-shaped crystals held under pressure in the leaf. Biting releases them into the mouth and throat, where they cause immediate mechanical injury — this is a physical burn, not a poison absorbed into the bloodstream, which is why it hurts instantly and why it rarely goes further than the mouth.
Signs to watch for
Oral irritation, intense burning and irritation of mouth, tongue and lips, excessive drooling, vomiting, difficulty swallowing.
How likely is it, really
Most cases are a chewed leaf rather than a meal. Calcium-oxalate plants punish the first bite — the burning is immediate, so animals usually stop straight away, and that self-limiting quality is why serious poisonings are rare. The exception is a young or determined animal that keeps going despite the pain.
Keeping the plant anyway
Height alone does not work with a cat — a cat treats a high shelf as a destination. What actually helps: a room the cat does not have unsupervised access to, a hanging position with no adjacent launch point, and clearing fallen leaves the same day, since a dropped leaf on the floor is the usual culprit. A pot of cat grass elsewhere in the room redirects the urge to chew far better than deterrent sprays do.
Is it toxic to people?
Yes, mildly. The same compound irritates human mouths and skin, so it is worth keeping Monstera out of reach of a toddler and washing your hands after pruning. Serious harm to an adult is very unlikely.
Confirmed pet-safe alternatives
Every plant below is listed by ASPCA as non-toxic to cats, and we checked each entry ourselves.
- Calathea — medium indirect light
- Spider plant — bright indirect light
- Hoya — bright indirect to some direct light, very drought-tolerant
- Parlor palm — medium indirect light
- Areca palm — bright indirect light
- Boston fern — bright indirect light
- Moth orchid — bright indirect light, very drought-tolerant
Sources and how we checked
Read directly from the ASPCA Animal Poison Control entry Cutleaf Philodendron; the agent and signs above are their wording. The full list is at aspca.org.
This is general information, not veterinary advice. Any animal that is actually unwell needs a vet, not a web page.
Is Monstera toxic to dogs? · Full Monstera care guide · All pet-safe houseplants