Quick Summary: Lilies and the Risk to Cats
True lilies (Lilium) and daylilies (Hemerocallis) are intensely toxic to cats. The petals, leaves, pollen, and even the water a lily has been sitting in can put a cat at risk of acute kidney failure. Here’s the quick rundown:
- True lilies (Lilium): lethally toxic to cats; can trigger acute kidney failure
- Oriental Lily
- Star Gazer Lily
- Easter Lily
- Asiatic Lily
- Daylilies (Hemerocallis): lethally toxic to cats; can trigger acute kidney failure
- Daylily
- Other plants with “lily” in the name that are also toxic
- Lily of the Valley: contains cardiac glycosides, which can affect heart function
- Peace Lily: contains insoluble calcium oxalate crystals; typically causes oral irritation and drooling
- Calla Lily: contains insoluble calcium oxalate crystals; typically causes oral irritation and drooling
- Safer / relatively safe options
- Cobra Lily (Darlingtonia): relatively non-toxic to both cats and dogs
- Peruvian Lily (Alstroemeria): accidental ingestion may cause mild GI upset
Three years ago, we adopted our first cat. We got Jupiter when she was just 4 months old. Like every new cat parent, we started out clueless. We knew the basics: chocolate and avocado are off-limits, and most human food isn’t great for cats in general. So we were careful about the kitchen, never leaving food out on the counter.
We thought we had it covered — until recently.
It all started with a simple thought: “It’d be nice to have a bit more green in the house.” After a friend gave us some empty pots, we started browsing for cute houseplants.
That’s when we stumbled onto something we never expected: a huge number of common plants are actually toxic to cats. Turns out our cat is far more fragile than we’d realized.
The deeper we dug, one name kept showing up again and again: lilies.
It turns out lilies are extremely toxic to cats. Terrifyingly so. There’s a subreddit called r/CatHelp where cat owners post desperate questions, often after their cat has gotten into something they shouldn’t have. And whenever lilies are involved, the story almost never ends well.
In one post, a cat had only brushed against a bouquet of lilies the owner had brought home. Within hours, the cat was in kidney failure. Even after emergency care, it passed away a few days later.
⚠️ If you suspect your cat has eaten or come into contact with something toxic, contact your vet or a local emergency animal hospital immediately.
The Horror of Lilies: Every Part Is Poison
Lilies are incredibly toxic to cats. That’s exactly why we chose them as the subject of our very first post.
Researchers haven’t fully pinned down the specific toxic compound yet, but it’s well established that the Lilium genus causes severe, acute kidney failure in cats.
Every part of the plant is laced with lethal toxins: the petals, the leaves, the stems, the easily-shed pollen, and even the water a vase of lilies has been sitting in.
Your cat doesn’t even have to eat any of it. A casual brush against the flower can leave pollen on their fur, and a single grooming session later, the toxin is already attacking their kidney cells, causing irreversible acute tubular necrosis.
Early signs of poisoning include vomiting, drooling, and lethargy. Without immediate veterinary care, it progresses to acute kidney failure, and from there it’s often fatal.
So If I Just Don’t Keep Lilies at Home, We’re Safe… Right?
Because lily toxicity is so severe and every part of the plant is poisonous, the danger goes way beyond the petals. The bulbs, the sap inside the stems, and even the pollen are all dangerous.
Looking at posts in cat communities, the most common scenario for lily poisoning isn’t a cat chewing on the plant. It’s pollen landing on the cat’s fur, the cat grooming itself later, and ingesting the toxin that way. Because the pollen itself is toxic, cat owners need to be careful even after visiting a flower shop or attending an event, since pollen can stick to your clothes and travel home with you.
Toxicity Varies by Species: Not All “Lilies” Are Equal
When we shop for plants, we tend to be guided by common names, but common names and scientific names often don’t match up.
The species that are lethally toxic to cats are true lilies (Lilium) and daylilies (Hemerocallis).
The Lilium genus includes florist favorites like the Oriental Lily, Star Gazer Lily, Easter Lily, and Asiatic Lily.
The Hemerocallis genus includes varieties like the Daylily.
These plants are an absolute no-go zone for cats. Even a tiny amount can trigger acute kidney failure.
Other plants with “lily” in their common name are also toxic to cats, but through entirely different mechanisms. Take Lily of the Valley: it isn’t a true lily, but it contains cardiac glycosides that directly affect a cat’s heart, potentially causing arrhythmia or even sudden death. For a cat, it’s every bit as dangerous as a true lily.
A different toxic mechanism shows up in common houseplants like the Peace Lily and Calla Lily, which contain insoluble calcium oxalate crystals.
These crystals are microscopic needle-like structures. When a cat chews on the plant, the tiny needles puncture the lining of the mouth, causing intense pain and drooling. It’s heartbreaking to watch, but it usually doesn’t lead to kidney failure.
Are There Any Safe Lilies?
Yes.
The Cobra Lily (Darlingtonia) is one of the few “lily” plants that’s relatively non-toxic to both cats and dogs, though it does need fairly high humidity to thrive.
The Peruvian Lily (Alstroemeria) is another option. Accidental ingestion can cause mild GI upset, but it ranks low on the toxicity scale. As long as your cat isn’t eating the entire plant, it’s unlikely to cause serious harm.
That said, if your cat has a habit of chewing on plants, the safest move is to grow a pot of wheatgrass (cat grass) and let that be their dedicated snack.
We Built an App to Solve This Problem
If you’re ever unsure whether a plant in front of you is safe, don’t let curiosity become a risk. Download MewGuard on the App Store — a scientifically grounded database of plants and foods you can check on the spot whenever you’re shopping or redecorating, so you can build a home that’s truly safe for the cat you love. MewGuard keeps adding new plants and human foods, growing into a more comprehensive reference for every cat parent.