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Are Lilies Toxic to Cats? Fatal Renal Toxicity in Daylilies & True Lilies

Every part of the lily plant—petals, leaves, pollen, and vase water—causes fatal acute renal failure in cats within 24 to 72 hours.

Data reviewed October 24, 2026

Lilies from the Lilium (true lily) and Hemerocallis (daylily) genera are among the most lethal feline toxins known to veterinary medicine. Cats are uniquely sensitive to an unidentified water-soluble nephrotoxin in lilies that causes rapid, irreversible necrosis of the renal tubular epithelial cells.

Deadly Lily Varieties for Cats
Common Name Botanical Genus Toxic Plant Parts Feline Lethality Tier
Easter LilyLilium longiflorumAll (Pollen, leaves, water)Fatal within 72 hrs
Stargazer LilyLilium orientalisAll (Petals, stems, pollen)Fatal within 72 hrs
Tiger LilyLilium tigrinumAll partsFatal within 72 hrs
DaylilyHemerocallis speciesAll partsFatal within 72 hrs
Peace Lily (Mauna Loa)Spathiphyllum (Not true lily)Calcium oxalate crystalsMouth pain, not fatal

How Cats Become Poisoned

A cat does not need to eat a leaf to die. If a cat brushes against a floral arrangement, gets microscopic yellow pollen on its fur, and grooms it off with its tongue, that microscopic dose is sufficient to cause total renal shutdown.

The 18-Hour Treatment Window

If an IV fluid diuresis protocol is initiated within 18 hours of exposure, cats have a strong chance of survival. Once 24 hours pass and anuria (kidney shutdown) sets in, dialysis is the only remaining option, with mortality exceeding 90%.

Frequently asked questions

Is lily vase water toxic to cats?
Yes! The nephrotoxin leaches into vase water. Cats that drink from a bouquet vase containing lilies frequently develop acute kidney failure.
What should I do if my cat has pollen on its fur?
Wash the cat thoroughly with gentle soap and water while wearing gloves, prevent them from grooming, and transport them immediately to an emergency vet.

Sources

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