Are Lilies Poisonous to Cats - Which Ones, and How Fast

This page is not veterinary advice. There are no doses, remedies or procedures here, deliberately. It exists so you can tell one plant from another and so you ring a vet fast when it matters.

If your cat has chewed, licked or brushed against a lily, phone your vet or an emergency vet now. Time is the single variable you can still change.

Yes, and more seriously than almost anything else a cat can meet in an ordinary living room. True lilies and daylilies damage a cat's kidneys, and the damage can be set in motion by an amount of plant material that looks trivially small.

The complication is that the word lily is attached to about a dozen unrelated plants, and only some of them are the dangerous ones. Getting that distinction right in your own house is most of the value of this page.

Which lilies are the dangerous ones

The ASPCA sets out the split plainly. The genera that cause kidney injury in cats are Lilium and Hemerocallis. For Lilium the ASPCA states that "all parts of the plant are toxic and small amounts can cause severe injury to the kidneys" (read 4 August 2026). Daylilies, Hemerocallis, do the same.

Common name	Genus	What it does to a cat
Easter lily, Asiatic lily, tiger lily, stargazer, Oriental hybrids	Lilium	Kidney injury. All parts toxic. The serious one.
Daylily	Hemerocallis	Kidney injury, same category of risk.
Lily of the valley	Convallaria	Not a kidney poison. Contains cardiac glycosides, and the ASPCA describes stomach upset and irregular heartbeat. A different emergency, still an emergency.
Peruvian lily	Alstroemeria	The ASPCA says it "may cause some stomach upset (vomiting, diarrhea)" and is not life threatening.
Peace lily	Spathiphyllum	Not a true lily. Insoluble calcium oxalate crystals, so mouth pain and drooling rather than kidney failure. Covered on our peace lily page.
Calla lily, arum lily	Zantedeschia	Also an oxalate plant, not a true lily.

Genus grouping and quoted descriptions from the ASPCA's guidance on which lilies are toxic to pets, read 4 August 2026.

The practical rule that comes out of this: if the label or the florist said lily and you cannot name the genus, treat it as the dangerous kind until a vet tells you otherwise. Guessing downward is the failure mode.

How a cat gets exposed without eating anything

This is the part that surprises people. The ASPCA names two routes that involve no deliberate eating at all: "Drinking the water containing a lily or grooming pollen off their fur".

Both of those are ordinary cat behaviour. A cat drinks from the vase because still water in a glass vessel is more interesting than the bowl. A cat walks past a bouquet on a side table, collects orange pollen on a shoulder, and then does what cats do for a third of their waking hours, which is groom.

  ROUTES INTO THE CAT

  bouquet on a table
        |
        +--> chews a leaf or petal ------+
        |                                 |
        +--> drinks the vase water -------+---> swallowed
        |                                 |
        +--> pollen lands on fur ---------+
                  |
                  +--> grooms it off

  All four arrive at the same place.
  Only one of them looks like eating a plant.

It follows that "I do not think she actually ate any" is not the reassurance it sounds like. Pollen on a coat, a wet chin near a vase, or a single bitten leaf edge are all worth a phone call.

The clock, and why eighteen hours is the number people quote

Two authorities give you the shape of the timeline. The ASPCA states that kidney injury "can be prevented by aggressive treatment at a veterinary hospital. However, it is often fatal if treatment is delayed longer than 18 hours after ingestion." The Merck Veterinary Manual's houseplant table describes the outcome as "renal failure in cats 2 to 4 days after ingestion" and notes that "delayed treatment is associated with poor prognosis" (read 4 August 2026).

  EXPOSURE                                       RENAL FAILURE
     |                                                 |
     v                                                 v
  [ 0h ]-----------[ 18h ]--------[ 48h ]--------[ 72-96h ]
     |                 |              |               |
   often no        the window     signs of        established
   visible         most often     kidney injury   kidney failure
   change          quoted for     appear
                   good outcomes

  The gap between "nothing to see" and "too late"
  is where every avoidable lily death happens.

Put the two together and the shape is clear. The window in which intervention works best sits almost entirely inside the period when the cat still looks normal. That is an unusually cruel design, and it is the reason this is one of the few things where we say ring now rather than watch and see.

Why cats and not dogs

Merck's entry is explicit that lily nephrotoxicity is "not reported toxic to other species", and the ASPCA notes that although lilies "can be toxic to both dogs and cats, however the effects are much more severe in cats". The toxic principle in Lilium and Hemerocallis has not been identified, which is itself worth knowing: there is no test strip, no home check, and no way to reason from the amount.

A dog who eats a lily petal is a stomach upset conversation. A cat who licks pollen off a paw is a kidney conversation. Same plant, different animal, genuinely different call.

Telling a true lily from everything else

You can usually do this from the flower itself, without a label.

  A TRUE LILY (Lilium)

          anther (heavy pollen, often rust-orange)
             \
              \    ____
               \  /    \        six tepals, three petals and
                \/  ()  \       three sepals that look alike
                /\      /
               /  \____/        strong scent in many hybrids
              /
        thick unbranched stem with
        narrow leaves running up it,
        no separate leaf stalks

  A DAYLILY (Hemerocallis)

        flowers rise on a bare stalk from a
        clump of long strap leaves at ground
        level. Each bloom lasts about one day.
        Hugely common in gardens and verges.

The pollen is the giveaway in a bouquet. Florists often remove the anthers to stop staining, which removes the most obvious clue at exactly the wrong moment, so do not read a missing anther as a missing lily.

What to do, and what to bring

Ring first. While you are on the phone, or immediately after, gather three things: the plant or a piece of it, a photograph of the whole plant including leaves, and the label if the bouquet came with one. Our page on what to have ready before you call the vet covers what else gets asked.

Do not attempt anything at home. The reasons are set out on our pet first aid page, which is a list of the things that make the next hour worse rather than a list of interventions. Washing pollen off fur is worth mentioning to the vet as a question rather than doing enthusiastically with whatever is under the sink.

A one-off audit of your own house

Twenty minutes, once, and the risk mostly disappears. Print this and walk round.

Look at every cut flower arrangement in the house and name the flowers. Not "some lilies". Names. Check the vase water is not reachable, and empty any vase your cat can put a head into. Check the windowsill and any pot plant bought as a gift, including bulbs forced indoors. Walk the garden borders and the front path for daylily clumps. Check the compost heap and the green bin, which is where old bouquets go and where cats sit. Tell whoever sends you flowers, in writing, that lilies cannot come into the house. Add a no lilies note to any delivery instructions you keep on file. Write your out of hours vet number somewhere you can read it without unlocking a phone. Photograph any plant you cannot identify, so you are not describing it from memory later.

The bouquet problem, which is a people problem

Most lily exposures in cat households do not come from a plant the owner chose. They arrive. Someone sends flowers for a birthday, a bereavement or an apology, and lilies are the default stem in a mixed bunch because they are cheap, large and long lasting. The cat owner takes delivery, is touched, and puts the vase on the hall table.

The fix is social rather than horticultural. Tell people once, clearly, and tell the florist rather than the sender if you can. Most florists will substitute without comment. Standing at the door refusing a bouquet is awkward exactly once, and it is a great deal less awkward than the alternative.

Questions people ask

She only licked the pollen off her leg. Is that really enough?

The ASPCA names grooming pollen off fur as a route of exposure alongside eating the plant. Treat it as an exposure and ring.

The vase water. Does that count if there is no plant left in it?

Drinking water that has held a lily is listed by the ASPCA as an exposure route. Mention it on the phone even if you are unsure how much was drunk.

My cat ate a peace lily. Is this the same emergency?

No, and the difference is real. Peace lily is Spathiphyllum and contains insoluble calcium oxalate crystals, which cause immediate mouth pain and drooling rather than kidney injury. It still merits a call, for different reasons. See our peace lily page.

How long until I know she is in the clear?

That is a question for your vet, because it depends on bloodwork rather than on how she looks. Merck describes renal failure developing two to four days after ingestion, so the reassuring point is later than most people assume.

What about spring bulbs, tulips and daffodils?

Different chemistry again. Merck attributes daffodil signs to "lycorine and related phenanthridine alkaloids" causing vomiting, abdominal discomfort, diarrhoea, dehydration and electrolyte imbalance. See daffodils and tulips.

Where the facts on this page come from

ASPCA, which lilies are toxic to pets. Genus by genus classification, exposure routes including pollen and vase water, and the eighteen hour statement. Read 4 August 2026.
Merck Veterinary Manual, houseplants and ornamentals toxic to animals. Renal failure in cats two to four days after ingestion, unknown toxin, not reported toxic to other species, and the oxalate mechanism for peace lily and dieffenbachia. Read 4 August 2026.

Where to go next

My cat ate something: what to do, the full walkthrough.
Poison control directory for pets, the wider reference.
Poison control directory, if you are holding something you cannot name.
Pet proof your home, room by room.
New kitten, the first 30 days, which covers the plant audit as part of settling in.
Find an emergency vet near you, worth doing before you need it.
Pet poison control directory, for organising what you know before the call.

One more time. Nothing on this page is a diagnosis or a treatment. With lilies and cats the useful action is a phone call made early, and early means while the cat still looks perfectly well.