Is Lily of the Valley Toxic to Cats?
Also known as: May Bells, Our Lady’s Tears, Convallaria majalis · Convallaria majalis
What makes it toxic
Cardiac glycosides including convallatoxin and convallarin, the same drug class as digoxin. They interfere with the heart’s sodium-potassium pump, disturbing rhythm and contractility; flowers, leaves, roots and even vase water are toxic.
Warning signs to watch for
Drooling, vomiting and diarrhea within hours, then lethargy, weakness, slow or irregular heartbeat, low blood pressure, seizures and potentially cardiac arrest.
What to do if your cat eats it
This is a drop-everything emergency. Go to a vet or animal ER immediately even if the cat looks fine — early decontamination and heart monitoring save lives. Bring a sample of what was eaten.
Common questions
Is one leaf of lily of the valley enough to harm a cat?
Yes, a small amount matters. The glycosides are potent, and a cat’s body weight leaves little margin. Treat any ingestion as an emergency.
Is it as dangerous as a true lily (Easter, tiger lily)?
The mechanism differs — true lilies destroy kidneys, while lily of the valley attacks the heart — but both are lethal threats to cats. Neither belongs in a cat household.
Is the water from a lily of the valley bouquet dangerous?
Yes. Glycosides leach into vase water, and a cat drinking from the vase can be poisoned. Discard bouquets safely and deny access.
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.