Pet safety answer · Cited to ASPCA
Is Lily of the Valley safe for cats?
Why it's toxic
Toxic principles: Cardenolides (convallarin, and others)
Clinical signs in cats: Vomiting, irregular heart beat, low blood pressure, disorientation, coma, seizures
Severity rating: severe
Source
Classification per the ASPCA Toxic and Non-Toxic Plants database entry for Lily of the Valley. Verified 2026-10-01. We update these answers when the source changes the classification.