Are Daylilies toxic to cats?
No. Daylilies (Hemerocallis species) are just as dangerous as true Lilium lilies — they cause the same acute kidney failure, and any exposure needs emergency treatment.
Responsible cat owners also keep parasite protection up to date — Best Vet Care ships prescription flea, tick and wormer treatments direct from licensed vets. (affiliate link)
Key facts
- Verdict: No — dangerous to cats. Daylilies should never be given deliberately.
- Category: Lily
- Onset: Signs can start 0–3 hours — see the full timeline below.
- If it's already happened: Call your vet now, or the Animal PoisonLine on 01202 509000 (24/7, charges apply) — see the emergency steps below.
If your cat has just eaten daylilies
- Treat as an emergency — kidney injury starts within hours.
- Call your vet immediately.
- If you can't reach your vet, call Animal PoisonLine (01202 509000) — paid triage, 24/7.
- Bring a piece of the plant or a photo.
What's the full picture?
Daylilies deserve exactly the same level of concern as true lilies, despite belonging to a different genus. 'True' lilies are Lilium species (Easter lilies, tiger lilies, Asiatic and Oriental lilies), while daylilies are Hemerocallis — named for the fact that each individual flower opens and dies within a single day. The specific toxin hasn't been fully identified by researchers, but every part of the daylily plant is dangerous: petals, leaves, stems, pollen, and even the water in a vase holding cut daylily stems. It takes a genuinely small amount — a couple of petals, a bit of chewed leaf, or pollen groomed off the fur — to cause severe poisoning in a cat, unlike many plants where a large ingestion is needed before real harm occurs.
Daylilies are extremely common in UK gardens, valued for their bright, low-maintenance summer flowers, and they turn up in mixed borders, along path edges, and in patio containers. Outdoor and semi-outdoor cats can encounter them simply by brushing past a flowerbed, walking through pollen-laden foliage, or lying near the plants, then transferring pollen or plant residue to their fur, which they later ingest while grooming. Cut daylilies in a vase are just as dangerous as garden plants, so they're also a real risk for indoor-only cats if a bouquet is brought into the house without anyone realising what's in it.
Once ingested, the toxin targets the kidneys directly, causing acute tubular necrosis — rapid, severe damage to the tiny filtering structures inside the kidneys. Early signs, usually within a few hours, are vomiting, drooling, and lethargy, which can look deceptively mild or even resolve temporarily. Underneath that apparent improvement, kidney damage is progressing; by 12 to 24 hours, cats typically become profoundly lethargic, stop eating, and may pass unusually little urine as kidney function declines. Without aggressive treatment, this progresses to complete kidney failure within 24 to 72 hours, which is frequently fatal.
There is no antidote and no effective home treatment — this is a genuine time-critical emergency. Decontamination (inducing vomiting, giving activated charcoal) and aggressive intravenous fluid therapy started within the first 18 hours of exposure gives cats a realistically good chance of preserving kidney function. Once significant kidney damage has already occurred, the prognosis worsens considerably, which is why any known or suspected daylily exposure — even if your cat currently seems fine — warrants an immediate vet visit rather than a wait-and-see approach.
Symptoms to watch for
We earn commission from some links below (Amazon Associates, Commission Junction, AWIN). This supports the site at no extra cost to you.
Cat owner essentials
For prescription-strength flea, tick and wormer protection, Best Vet Care ships direct from licensed vets — no vet visit required. (affiliate link)
Questions owners ask
Are daylilies really as dangerous as true lilies?
Yes, this is one of the most important things for cat owners to know. Despite the different genus name, Hemerocallis daylilies cause the same acute kidney failure as true Lilium lilies, at similarly small exposure levels. Treat any daylily exposure with the same urgency as a true lily exposure.
My indoor cat has no garden access — still a risk?
Yes. Cut daylilies in a vase, bought as part of a mixed bouquet or grown-flower delivery, are just as toxic as garden plants, and pollen can shed onto surfaces or fur even without direct chewing. Check any flowers brought into the house, and if daylilies are present, remove them from any room your cat can access.
What if my cat only sniffed the flower or brushed against it?
Pollen transfer alone, later removed by grooming, has been enough to cause poisoning in documented cases, so don't assume brief contact is safe. If you know or strongly suspect any contact with daylily pollen or plant material, contact your vet rather than waiting for symptoms to confirm it.
Can dogs be poisoned by daylilies too?
Dogs can develop mild stomach upset from eating daylilies but do not appear to suffer the same catastrophic kidney damage that cats do — the severe nephrotoxic effect is specific to cats. This doesn't mean daylilies are fine for dogs to eat freely, but the emergency-level danger described here is a cat-specific risk.
If your cat keeps returning to the wrong plant, a pet-safe plant deterrent spray can break the habit without harm.
Recommended for cat owners
Related
Sources referenced for this guidance
- Veterinary Poisons Information Service (VPIS) — UK clinical toxicology reference used by vets
- International Cat Care — feline-specific clinical guidance
- BSAVA — British Small Animal Veterinary Association reference materials
- Merck Veterinary Manual — professional veterinary reference
About this guidance
Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.
This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.
Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.
Last reviewed: · By the What Can My Cat Eat? editorial team