Lily

What it does to a cat.

Yes — true lilies are among the most dangerous plants a cat can encounter. The ASPCA lists all Lilium species — Asiatic, Oriental, Tiger, Stargazer, Easter — and daylilies (Hemerocallis) as severely toxic. Ingesting any part, including pollen and the water in the vase, can cause acute kidney failure that is often fatal without rapid treatment.

The toxin is unidentified but the pattern is unmistakable: vomiting within hours, then a quiet phase, then kidney shutdown over the next two to three days. A cat that seems to recover after the initial sickness may already be in renal failure.

Which "lilies" actually kill

Only the true lilies do. Peace lily (Spathiphyllum) and calla lily (Zantedeschia) are not lilies at all — they cause painful mouth irritation from oxalates but rarely threaten the kidneys. Peruvian lily (Alstroemeria), the small lily-like flower in supermarket bouquets, is ASPCA non-toxic. When you cannot tell which is which, assume the deadliest and keep all of them away.

The seasonal trap

Lilies arrive at Easter, in Mother's Day bouquets, and in funeral arrangements — moments when nobody is thinking about the cat. See the Easter lily page for the most common household offender. If you want flowers in a cat home, choose orchids or roses instead, and ask florists to leave every lily out of the arrangement.