Lily of the Valley (Convallaria majalis) is a popular ornamental plant prized for its perfumed, bell-shaped white flowers. Whilst beautiful, this plant poses a serious poisoning risk to pets.

All parts of the Lily of the Valley plant are toxic, including the flowers, leaves and stems. The plant contains toxins known as cardiac glycosides, which interfere with the normal electrical activity of the heart. These toxins are similar to digoxin, a medication used in both human and veterinary medicine to treat heart conditions. Due to its high concentration of toxins, caution is recommended when this plant is present around pets.

Although pet poisoning from this plant is not commonly reported, it can occur following relatively small ingestions. Pets may be exposed when chewing on garden plants, biting into bouquets, or drinking from vases containing the flowers. Because of the potency of these cardiac glycosides, even a small nibble has the potential to result in harmful effects.

Early signs of poisoning may include drooling, refusal to eat or drink, vomiting (in those animals that can vomit) and diarrhoea. As poisoning progresses, animals may become weak, lethargic and unsteady on their feet. In severe cases, poisoning may affect the heart’s rhythm, resulting in a slow, fast, or irregular heartbeat, collapse, or even death. Signs can occur within a few hours of ingestion, and the severity will depend on the amount consumed and the size of the animal.

Lily of the Valley should not be confused with “true lilies” (Lilium or Hemerocallis species), which are particularly toxic to cats and can cause acute kidney failure even with minor exposures. To help prevent Lily of the Valley poisoning, pet owners should:

✅ Keep floral arrangements containing this plant out of reach, and discard vase water safely.

✅ Supervise pets in gardens, especially those with a history of chewing on plants.

✅ Avoid planting Lily of the Valley in areas accessible to pets.

Whilst prevention is always best, accidental poisoning can happen. Veterinary care for plant exposures can be costly. Pet insurance can provide peace of mind and financial protection during these stressful events. The Animal Poisons Helpline is proudly sponsored by Bow Wow Meow Pet Insurance, who are currently offering two months free on their Nose-to-Tail Cover during the first year for Helpline followers. Learn more at: quote.bowwowinsurance.com.au

If you suspect your pet has ingested Lily of the Valley or any other poisonous plant, contact the Animal Poisons Helpline immediately, even if your pet looks well:
☎️ 1300 869 738 (AU), 0800 869 738 (NZ) , 3106 4216 (SG), (917) 722-5958 (US) or +1917-722-5958 (CAN).

If you’re a veterinary professional, we invite you to join the Animal Poisons Centre For Vets Facebook group, which is regularly updated with toxicology tidbits and emerging trends.