What are the symptoms of Lily of the Valley poisoning in cats?

vomiting, diarrhea, cardiac irregularities, weakness, dilated pupils, seizures (severe cases)

Lily of the Valley

Q: Is Lily of the Valley toxic to cats?

Toxic: Toxic — cardiac glycosides affect the heart. Lily of the valley (Convallaria majalis) contains cardiac glycosides (convallatoxin) similar to digitalis. Ingestion can cause dangerous cardiac arrhythmias. All parts of the plant are toxic. This is a common garden plant in temperate climates. Source: ASPCA.

Toxic

Verdict

Toxic — cardiac glycosides affect the heart.

Toxic principle: cardiac glycosides (convallatoxin)

Source: ASPCA · Verified 2026-06-12

If your cat ate this

Cats hide symptoms — don't wait and see. Even small amounts of certain substances can be fatal to a cat. Act fast.

1. Call your veterinarian immediately
US — National hotline: ASPCA Animal Poison Control Center (888) 426-4435 aspca.org(24/7, Consultation fee may apply.)
US — National hotline: Pet Poison Helpline (855) 764-7661 petpoisonhelpline.com(24/7, $89 per incident fee; also covers Canada.)
GB — National hotline: Animal PoisonLine 01202 509 000 animalpoisonline.co.uk(24/7, £35 per call (8am–8pm weekdays), £45 at other times.)
AU — National hotline: Animal Poisons Helpline 1300 869 738 animalpoisons.com.au(24/7)
NZ — National hotline: Animal Poisons Helpline 0800 869 738 poisons.co.nz(11am–7pm NZ time (currently being extended), Charges apply.)
CA — National hotline: Pet Poison Helpline (855) 764-7661 petpoisonhelpline.com(24/7, $89 per incident fee.)

Verified 2026-08-06

Verdict

Lily of the valley (Convallaria majalis) contains cardiac glycosides (convallatoxin) similar to digitalis. Ingestion can cause dangerous cardiac arrhythmias. All parts of the plant are toxic. This is a common garden plant in temperate climates.