Is Boston Ivy Toxic to Cats?
Also known as: Japanese Creeper, Bostonian Ivy, Grape Ivy (colloquial), Parthenocissus tricuspidata · Parthenocissus tricuspidata
What makes it toxic
Insoluble calcium oxalate crystals in the foliage and berries. Chewing releases needle-like raphides that pierce the soft tissue of the mouth, tongue and throat.
Warning signs to watch for
Burning mouth pain, drooling, pawing at the face, vomiting and reluctance to swallow within minutes to hours. Berries eaten in quantity add diarrhea.
What to do if your cat eats it
Rinse the mouth with water, remove any plant material and offer milk or water. Call your vet if drooling and vomiting continue beyond an hour, or immediately if breathing appears affected.
Common questions
Can a cat be poisoned by a wall of Boston ivy outdoors?
Only by chewing it — the plant does not shed toxins. Outdoor cats that sample the leaves get a painful mouth but rarely anything life-threatening; stop the habit before it becomes routine.
Is Boston ivy the same as grape ivy houseplant?
No. Grape ivy (Cissus rhombifolia) is a different, non-toxic houseplant; Boston ivy (Parthenocissus tricuspidata) is the wall-climbing vine and is toxic. The shared nickname causes constant confusion.
Are the blue-black berries the worst part?
They carry the same crystals plus irritants, and animals that eat clusters get worse GI signs than leaf-chewers. Sweep fallen berries away from pet areas in autumn.
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.