Is Castor Bean Toxic to Cats?
Also known as: Castor Oil Plant, Palma Christi · Ricinus communis
What makes it toxic
Ricin, an extremely potent toxin concentrated in the seeds. Chewing breaks the seed coat and releases ricin, which shuts down protein synthesis in cells and causes organ failure.
Warning signs to watch for
Delayed by several hours to two days: burning mouth, vomiting, bloody diarrhea, abdominal pain, weakness, seizures and eventual kidney and liver failure.
What to do if your cat eats it
Treat any suspected seed ingestion as a life-threatening emergency. Go to an emergency vet immediately, even if the cat seems normal, and bring the seed or plant for identification.
Common questions
Can a cat die from one castor bean seed?
A fully chewed seed can be fatal to a small animal. Deaths are documented in pets, which is why even one seed is a go-now emergency.
Is the plant safe if it never sets seeds?
Safer, but not safe. Leaves, sap and stems contain smaller amounts of toxin, and ornamental plants can set seeds suddenly in warm weather.
More plants checked for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.