Plants Toxic to Cats: The Vet-Reviewed List and Safe Swaps

Plants toxic to cats cause different kinds of harm. Some irritate the mouth or stomach; others can damage organs or be fatal. True lilies require immediate veterinary care after an exposure, even before signs appear.

This guide sorts the plants toxic to cats into three urgency levels, names the part of each plant that actually carries the poison, and says when signs should appear. Every toxicity call here comes from a primary veterinary source rather than a plant-care site.

Two numbers are worth saving before you read another line: the ASPCA Animal Poison Control Center at (888) 426-4435 and Pet Poison Helpline at (855) 764-7661. Both answer 24 hours a day, and both charge a consultation fee.

Which plants are toxic to cats?

Plants harmful for cats to eat include true lilies and daylilies, sago palm, oleander, azalea, autumn crocus, and many common houseplants. Some cause mouth irritation or stomach upset; others can injure organs. Identify the plant and call for advice after a suspected exposure rather than judging the risk from how well your cat looks.

Three urgency levels cover every plant named on this page, and each plant keeps its level everywhere it appears.

• Call a veterinarian now. Plants that can damage the kidneys, liver, or heart. Treatment works best before signs appear, so the call is not conditional on your cat looking unwell.
• Be seen today. Plants that cause more than mouth irritation: repeated vomiting, diarrhea, weakness, or an unsteady walk. A same-day exam decides whether your cat needs fluids or anti-nausea treatment.
• Monitor at home, after a phone call. Plants that irritate the mouth and stomach. Follow the monitoring plan given for your cat. Inability to swallow, continued vomiting, or refusal of water needs prompt veterinary reassessment.

These levels are a clearer arrangement of what the primary sources already publish about each toxin. They are not a clinical scale, and no veterinarian will recognize them by name on the phone.

Do not use a household safe-dose cutoff for an emergency-tier plant. Veterinary references describe different toxins and exposures; they do not supply one number that clears an individual cat. The amount still matters to the clinician, so report what may have been swallowed without delaying the call.

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A possible true-lily or daylily ingestion needs emergency veterinary advice even when the amount seems small, including pollen groomed off a coat. Do not wait for a particular dose or for signs to appear.

Plant status throughout this guide follows the ASPCA toxic and non-toxic plant database, with mechanisms and signs from Pet Poison Helpline and the Merck Veterinary Manual.

The toxin behind each tier

Each urgency level maps to the toxic principle the ASPCA plant database records for the plant, with what it does in the body taken from Pet Poison Helpline and the Merck Veterinary Manual.

• Call a veterinarian now: an unidentified nephrotoxin in true lilies and daylilies (acute kidney injury); cycasin in sago palm (liver failure); cardiac glycosides in oleander, foxglove, and lily of the valley (abnormal heart rhythm); grayanotoxins in azalea and rhododendron (drooling, weakness, collapse); colchicine in autumn crocus (multi-organ damage, often delayed); taxine alkaloids in yew (sudden cardiac failure); ricin in castor bean seeds (severe gut signs and collapse).
• Be seen today: bufadienolides in kalanchoe and terpenoid saponins in cyclamen (vomiting, then heart-rhythm changes after a large ingestion); tulipalin in tulips and lycorine in daffodils, both concentrated in the bulb (drooling, vomiting, breathing and heart changes); pyrethrins and sesquiterpene lactones in chrysanthemum (vomiting, incoordination, skin irritation).
• Call for an individual plan and monitor only if advised: insoluble calcium oxalate crystals in pothos, philodendron, monstera, peace lily, and dieffenbachia (immediate mouth pain and drooling); saponins in snake plant, dracaena, yucca, and English ivy (drooling, vomiting); saponins and anthraquinones in the latex of aloe vera (vomiting, diarrhea, lethargy).

The most dangerous plants for cats

The most dangerous plant for a cat is the true lily. Nothing else in an ordinary home destroys kidney tissue as quickly, and nothing else does it from a quantity as small as the pollen a cat licks off her own fur.

After lilies, the plants that can kill a cat sort by what they attack: the liver, the heart, or the cells that divide fastest in the body.

• Sago palm (Cycas revoluta) attacks the liver. Every part is toxic and the seeds carry the most cycasin. It is sold as an indoor palm across most of the country, which is exactly how it reaches living rooms.
• Oleander, foxglove, and lily of the valley attack the heart. All three carry cardiac glycosides, which change how the heart muscle contracts. Vomiting usually comes first, and a dangerous rhythm can follow.
• Yew (Taxus) also attacks the heart, through taxine alkaloids in the needles, bark, and seeds. It is a hedge plant, so outdoor cats meet it more often than indoor cats do.
• Azalea and rhododendron carry grayanotoxins in the leaves and flowers. Drooling and vomiting come first, with weakness, a slowed heart rate, and collapse in a serious exposure.
• Autumn crocus (Colchicum autumnale) carries colchicine, which damages fast-dividing cells throughout the body. Its signs can be delayed, so a cat who looks fine that evening has not been cleared.
• Castor bean (Ricinus communis) carries ricin, concentrated in the seed. It is grown as an ornamental, and the seeds are the part that matters.
• Kalanchoe and cyclamen sit just below this group. Kalanchoe carries bufadienolides that affect the heart, and cyclamen keeps its saponins in the tuber under the soil.

Two of these are routinely mistaken for something safer. Sago palm is not a palm at all, and the true palms sold as houseplants, areca, parlor, and ponytail, are not on the ASPCA toxic list.

Autumn crocus is likewise not the spring crocus that comes up in March, which causes far milder stomach upset. If you cannot tell which one you have, treat it as the dangerous one and call. That is the cheaper mistake.

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Lilies: the one plant that is a true emergency

The word lily on a florist tag is not a reliable guide, because several plants sold as lilies are not true lilies. Peace lily, calla lily, and Peruvian lily carry different toxins and cause mouth or stomach irritation rather than kidney failure.

That distinction does not make the call optional. If the plant might be a Lilium or a Hemerocallis, it is treated as one until a veterinarian or a poison control specialist says otherwise.

Kidney bloodwork and hospitalized fluid support are the standard veterinary response, and the window for them is short. Your veterinarian decides the plan. Your job is to call early enough that there is still a plan to make.

The most common toxic houseplants

Indoor plants poisonous to cats include pothos, philodendron, monstera, peace lily, and dieffenbachia. These aroids contain insoluble calcium oxalates that irritate the mouth when chewed. A green houseplant is not automatically safe, and homes with cats and dogs should check the botanical entry for both species.

Those crystals are needle-shaped. When a cat bites a leaf they embed in the lips, tongue, and throat and release immediately, which is why the reaction looks so dramatic within seconds.

It hurts, and it looks frightening, but it is rarely fatal. Most cats stop chewing after the first mouthful, which is the plant's own defense doing its job. The signs to expect:

• Sudden pawing at the mouth or face
• Heavy drooling, sometimes foamy
• Vocalizing, head shaking, or backing away from the plant
• Vomiting once or twice
• Reluctance to eat or drink for a few hours

Call your veterinarian even for this tier. Swelling of the lips, tongue, or throat is the uncommon complication that turns an irritation into an airway problem, and that needs to be examined rather than watched.

One entry on that table is not like the others. Sago palm is sold beside genuine houseplant palms, and it is the only plant there that can cause liver failure. If you own one and you also own a cat, removal is the only version of this advice that works.

Which parts of a plant are toxic, and does touching count?

Flowers and other toxic plants do not always have to be swallowed to harm a cat. Chewing can release mouth irritants, sap can affect skin, and lily pollen on fur can be swallowed during grooming. Drinking lily vase water is another ingestion route. Identify what contact occurred rather than assuming that no missing petal means no exposure.

Which part carries the poison changes the whole picture. A tulip bulb in a bag in the garage is a far bigger problem than a tulip bloom in a vase, because tulipalin concentrates in the bulb.

The same logic runs through the garden. Daffodil, hyacinth, and amaryllis all concentrate their alkaloids in the bulb. Sago palm concentrates cycasin in the seeds. Cyclamen keeps its saponins in the tuber below the soil line. Where the risk actually sits:

• Bulbs and tubers: tulip, daffodil, hyacinth, amaryllis, cyclamen, autumn crocus
• Seeds and nuts: sago palm, castor bean, yew
• Sap: dieffenbachia, ficus, euphorbia, wandering dude
• Pollen: true lilies and daylilies
• Green leaves and stems, not the ripe fruit: tomato and potato plants
• Every part at once: oleander, foxglove, lily of the valley, true lilies

Chewing carries a second risk that has nothing to do with toxins. Long fibrous leaves, palm fronds, and grass-like foliage can bunch up in the stomach or intestine, so a plant that is chemically harmless can still cause an obstruction that needs surgery.

Vomiting that keeps repeating, a cat who stops eating, or straining in the litter box without producing anything is the pattern to take seriously, whatever the plant turns out to have been.

Toxic garden and outdoor plants

Toxic garden plants for cats include lily of the valley, foxglove, oleander, yew, azalea, rhododendron, autumn crocus, hydrangea, hosta, peony, and the green parts of tomato and potato plants. Bulb beds are the highest-risk feature of most yards.

An outdoor cat meets far more plants than an indoor one, and you control almost none of them. Outdoors, recognition rather than removal is the practical skill. Sorted by urgency:

• Call a veterinarian now: lily of the valley, foxglove, oleander, yew, azalea, rhododendron, autumn crocus, castor bean, and any true lily or daylily in a border.
• Be seen today: tulip, daffodil, hyacinth, and amaryllis bulbs, plus chrysanthemum, kalanchoe, and cyclamen. For English ivy, call for an individual plan and monitor only if advised.
• Monitor at home after a call: hydrangea, hosta, peony, begonia, geranium, and the green leaves and stems of tomato and potato plants.
• Hydrangea is the one gardeners ask about most. Its leaves and flower buds contain a cyanogenic glycoside, and the usual result described by the ASPCA is vomiting, depression, and diarrhea rather than anything life-threatening.
• Vegetable beds surprise people too. Ripe tomatoes are not the issue. The green leaves and stems contain solanine, and potato foliage works the same way, so a cat chewing the plant rather than the fruit is what causes trouble.

The edible garden also raises a boundary this guide does not cross. Food toxins for cats, including chocolate, grapes, and onions, are a separate subject with a separate list, and the guide to whether cats can eat chocolate is the right place to start on those.

Sugar snap pea plants need to be distinguished from ornamental sweet peas. The edible pea is commonly labeled Pisum sativum (now also Lathyrus oleraceus); the ASPCA’s vegetable-garden advice permits peas as a moderate food treat, which is not a blanket clearance for every part of an unidentified garden plant. Ornamental sweet pea, Lathyrus odoratus, has a toxic listing for cats. Give the veterinarian the botanical label if your cat has chewed a pea plant. See the ornamental sweet-pea warning.

Toxic flowers and cut bouquets

Cut flowers deserve separate treatment, because a bouquet brings several species into the house at once and arrives already stripped of the tags that would let you identify them.

The short version: true lilies and daylilies are the emergency, tulip and daffodil stems are worth a same-day call, chrysanthemums cause drooling and vomiting, and carnations cause mild stomach upset and skin irritation. Roses, sunflowers, snapdragons, and orchids are not listed as toxic.

The vase water is part of the risk rather than a footnote. If an arrangement contains a lily, treat the water as contaminated and keep your cat away from it, and dispose of trimmings where she cannot reach them.

Are herbs like lavender and basil toxic to cats?

The ASPCA lists lavender, mint, oregano, and chamomile as toxic to cats; basil, rosemary, and dill have different verdicts. Chamomile flowers are not a cat-safe edible choice: the Anthemis nobilis entry describes contact dermatitis and gastrointestinal effects. Check each herb’s botanical name instead of applying one rule to culinary plants.

The surprise is usually lavender. It is sold as a calming plant for people and owners assume that transfers. The plant contains linalool and linalyl acetate, which irritate a cat's stomach when eaten.

• Listed as toxic: lavender, mint (Mentha species), oregano, chamomile, and tarragon. Expect drooling, vomiting, or diarrhea.
• Not listed as toxic: basil, rosemary, dill, thyme, and lemon balm. Any of them can still cause an upset stomach if a cat eats a lot.
• Catnip and cat grass differ: ASPCA lists catnip (Nepeta cataria) as toxic, with nepetalactone linked to vomiting, diarrhea, stimulation or sedation. Cereal-grass cat grass is a separate chewing option, usually grown from oat, wheat, barley, or rye seed.

The far bigger herb hazard is not the plant at all. Concentrated essential oils, lavender oil included, are handled poorly by cats, whose livers lack some of the enzymes that process them, and they cause serious illness through licking, spills, and diffusers.

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A lavender plant on a windowsill and a bottle of lavender oil are not the same risk. Pet Poison Helpline treats concentrated oils as a separate and more serious category, and so should you.

The plants cat owners ask about by name

A handful of plants generate most of the searching. Here is the verdict on each, and the reason behind it.

Are orchids toxic to cats?

No. The moth orchid (Phalaenopsis), the type sold in nearly every grocery store, is not listed as toxic to cats. Not listed as toxic does not mean edible: a cat who eats a lot of any plant can still vomit, and the bark or moss in the pot can upset a stomach on its own.

Are roses toxic to cats?

No. Roses are not listed as toxic to cats. The risks with roses are mechanical and chemical instead, because thorns can cut a mouth or a paw, and florist stems are often treated with preservatives or pesticides a cat should not lick.

Are tulips and other flower bulbs toxic to cats?

Yes, and the bulb is the part that matters. Tulips carry tulipalin A and B, concentrated in the bulb rather than the bloom, so a cat digging in a planting bed or a stored bag of bulbs meets a far larger dose than one nibbling a petal.

Daffodil, hyacinth, and amaryllis follow the same pattern with lycorine and related alkaloids. Any bulb ingestion is a same-day veterinary call.

Are snake plants toxic to cats?

Yes, mildly. Snake plant, also sold as mother-in-law's tongue, contains saponins and is listed as toxic to cats. Expect nausea, drooling, vomiting, or diarrhea rather than organ damage. Call your veterinarian, then watch her closely.

Are spider plants toxic to cats?

No. Spider plant (Chlorophytum comosum) is on the ASPCA non-toxic list. Cats are unusually drawn to it, and a cat who strips the foliage can still vomit, but the plant itself is not a poisoning risk.

Is pothos toxic to cats?

Yes. Pothos and its lookalike philodendron both carry insoluble calcium oxalate crystals, and both cause immediate mouth pain, drooling, and sometimes vomiting. This is the most common plant exposure in cat households. It is rarely fatal, but the pain is real and the call is still worth making.

Is monstera toxic to cats?

Yes, in the same way pothos is. Monstera deliciosa, sold as the Swiss cheese plant, carries the same insoluble calcium oxalate crystals in its leaves and sap. The result is immediate mouth pain and drooling rather than organ damage.

Is aloe vera toxic to cats?

Yes. Aloe is listed as toxic to cats because of saponins and anthraquinones in the yellow latex just under the leaf skin. Vomiting, diarrhea, and lethargy are the usual signs, and the medicinal reputation of the gel is exactly why owners do not suspect it.

Holiday plants: poinsettia, mistletoe, and the Christmas tree

Poinsettia has the worst reputation and the mildest reality. Its milky sap irritates the mouth and stomach, and the usual result is drooling or a single vomit rather than a poisoning.

Mistletoe and holly are the ones to watch in December. Both cause stomach and intestinal upset, and a large mistletoe ingestion can affect the heart. Fir and pine needles are irritants, the stagnant water in a tree stand is worth blocking off, and amaryllis bulbs are a genuine same-day call.

Quick verdicts for the other plants people ask about

These are the plants that come up constantly and rarely get a straight answer. Status follows the ASPCA plant database, where not listed as toxic means no known systemic poisoning rather than harmless.

Three names on that table cause most of the confusion. Money plant, money tree, and lucky bamboo are common names shared by more than one species, and in each case at least one of those species is toxic.

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When a common name is doing the work, the botanical name settles it. That is the single most useful habit for anyone keeping plants and cats in the same house.

How to identify a toxic plant in your home

The fastest way to identify a plant is to photograph the whole plant and one leaf close up, then search the ASPCA toxic and non-toxic plant database by common name and cross-check the botanical name it returns.

Plant identification apps are useful for narrowing down a candidate and unreliable as a final answer, especially between lookalikes. Use one to generate a name, then confirm that name against a veterinary source. The routine that pays off:

1. Keep the nursery tag. Tape it to the underside of the pot instead of throwing it away, because the botanical name printed on it is what a poison control specialist will ask for.
2. Photograph every plant you own once, in daylight, with a leaf and any flower or fruit in frame. A photo library beats memory during an emergency call.
3. Search by botanical name rather than common name. Common names are shared across unrelated species, and that is where the dangerous mix-ups happen.
4. Settle the sago palm question specifically. It is sold as a palm, it looks like a palm, and it is a cycad that can cause liver failure.
5. Walk the whole house once, including the high shelf, the hanging basket, and the bathroom. The plant that gets chewed is usually the one nobody counted.

Then print or save the list you end up with. The moment you need it is the moment you will not want to be searching for it.

Veterinary references such as the VCA pet health library and the Cornell Feline Health Center are useful second checks when a plant database entry is ambiguous.

Symptoms of plant poisoning in cats

If your cat ate a plant and threw up, stop further exposure and call your veterinarian with the plant’s identity and the signs you have seen. Vomiting, drooling, mouth pawing, loss of appetite, and lethargy can accompany plant poisoning, but cannot identify the toxin on their own. Trouble breathing, collapse, or difficulty swallowing needs urgent care.

Timing carries information. A cat who reacts within seconds has almost certainly hit an irritant. A cat who seems fine for a day and then goes quiet may have met something far worse.

Those onset windows follow the descriptions published by the ASPCA Animal Poison Control Center, Pet Poison Helpline, and the Merck Veterinary Manual. None of them is a guarantee, and a cat can fall outside a window in either direction.

The row that matters most is the lily row. Cats exposed to a true lily often vomit, then look better, and that apparent recovery is the most dangerous part of the whole picture.

Go now, regardless of which plant you suspect, if you see any of these:

• Difficulty breathing, or swelling of the face, lips, or tongue
• Repeated vomiting, or vomit containing blood
• Weakness, staggering, collapse, or a heartbeat that seems very fast or very slow
• Tremors, twitching, or a seizure
• No urine at all, or straining in the litter box
• Refusing food and water for more than a few hours

Vomiting has many causes besides plants. If you are not certain a plant was involved, the guide to why a cat throws up covers the wider set of possibilities.

What to do if your cat ate a toxic plant

If your cat ate a toxic plant, take the plant away, look in her mouth without forcing it open, and call your veterinarian or a poison control line before you do anything else. Do not try to make her vomit.

If your cat ate bell pepper plant leaves or another kitchen-garden plant, report the leaves or stems as well as any fruit eaten. A food that people or pets can eat does not establish the safety of every plant part, its pesticide treatment, or the potting mix. Use the same identification-and-call steps for an uncertain plant. ASPCA explains why garden parts and treatments need separate checks.

When you call, lead with three things:

• The plant. Read the botanical name off the tag if you have it, because poison control specialists work from that rather than from a description of the leaf.
• The time. Roughly when it happened, and whether your cat has vomited or drooled since.
• The cat. Weight, age, medications, and any existing health conditions.

Expect to be given a case number. Your veterinary clinic uses that number to speak with the toxicologist directly, and that consultation is what the fee buys.

If you cannot reach anyone and your cat is showing any of the go-now signs above, drive. An unnecessary emergency exam is a far better outcome than a delayed one.

Two things are worth knowing before that drive:

• What it may cost. Toxin ingestion is one of the most common unplanned emergency bills cat owners face, and knowing what emergency veterinary care costs in advance takes one decision out of a bad night.
• What happens there. Decontamination, bloodwork, and fluid therapy are decisions your veterinarian makes once the plant is identified. None of them has a home version, which is why this guide stops at the clinic door.

How to keep your cat away from toxic plants

Do cats know to stay away from toxic plants?

Cats do not reliably avoid toxic plants. They chew greenery out of curiosity, boredom, texture-seeking, and habit, and nothing about a plant's toxicity makes it taste like a warning.

Some cats ignore every plant in the house for years and then start on a new one. Prevention that depends on your cat's judgment is not prevention. The order of these steps matters, because the later ones only work on plants that were survivable to begin with.

1. Remove the emergency-tier plants completely. Lilies, sago palm, oleander, and autumn crocus do not belong in a house with a cat at any height. This is the only step that is not a compromise.
2. Move the rest out of reach, then check your assumptions. Height alone fails with most cats. A shelf works only if there is no route to it from a counter, a chair back, or a bookcase.
3. Use physical barriers where you can. Closed rooms, glass cabinets, terrariums, and hanging baskets away from furniture do more than any spray.
4. Make the pot boring. Large pebbles or a mesh cover over the soil stop digging, and they stop the litter-box behavior that starts with an open pot.
5. Treat deterrents as an optional aid, not a barrier. Use a product only on the household surfaces its label permits, and keep your cat away from treated surfaces until the label says they are ready. Do not spray living leaves or stems unless the product specifically permits that use. Keep toxic plants physically inaccessible.
6. Give the chewing somewhere to go. Cat grass grown with an Imperial Cat Easy Grow Cat Oat Grass Kit is one option to try while keeping toxic plants inaccessible. Offering an alternative does not make a toxic plant safe.

Offer other activities too. Interactive play, a window perch, and rotating toys can be part of your enrichment plan. Keep physical barriers in place regardless of whether your cat seems less interested in the plants.

Plants are one hazard among several in an ordinary home. The guide to poison-proofing your cat's home covers the cleaners, medications, and small objects sitting in the same room as the plant.

Safe swaps: what to grow instead

The table pairs toxic plants with safe replacements suited to the same location and growth habit. Hoya or Swedish ivy can replace trailing pothos on a shelf, while haworthia can replace aloe on a windowsill. Check the botanical identity of the replacement, then choose for the light and space you actually have.

Non-toxic here means the ASPCA does not list a known systemic poison for that plant. It does not mean harmless. Any cat who eats enough of any plant can vomit, and any long leaf can cause an obstruction.

Cat grass grown from oat, wheat, barley, or rye seed offers a separate chewing option. Try a supervised tray if your cat enjoys it, while keeping toxic plants inaccessible; interest in grass does not guarantee your cat will leave other plants alone.

Cat grass is not catnip. Supervise access, keep it fresh, and do not dismiss vomiting after chewing as automatically normal. Contact your veterinarian if vomiting continues, other signs develop, or the identity of the plant is uncertain.

If a cat suddenly starts eating plants after ignoring them for years, treat that as a change worth mentioning to your veterinarian rather than a habit to manage, because appetite and behavior changes have medical causes too.

The full list of cat-safe plants

This page is the toxic side of the question, and it names safe plants only where they replace something you are removing. The complete vetted list of cat-safe houseplants, flowers, and garden plants is a longer piece of work with its own qualifiers.

The qualifier worth repeating here is the important one. A plant that is not listed as toxic can still cause vomiting, diarrhea, or an obstruction if a cat eats enough of it. Non-toxic is a statement about poisoning, not a promise of safety.

What about dogs?

Many of these plants are toxic to dogs as well, but the list is not the same and neither is the picture. True lilies, the defining cat emergency, cause only mild stomach upset in dogs.

Dogs run into different problems. Sago palm and flower bulbs hurt them more because dogs dig and chew in larger quantities, and the dog toxin picture is dominated by foods that have no cat equivalent.

If you have both species, check each plant’s verdict for cats and for dogs. A cat-safe label alone does not clear a plant for a dog, and access to fallen leaves, bulbs, seeds, and potting materials also matters.

Toxic plant questions cat owners ask