Is the ZZ Plant Toxic to Cats, Dogs & People?

The ZZ plant (Zamioculcas zamiifolia) is one of the toughest, most forgiving houseplants you can own — which is exactly why so many of us keep one. If you live with a curious cat, a leaf-chewing dog, or a small child, the important distinction is that ZZ plants usually cause painful local irritation rather than the type of systemic poisoning associated with some more dangerous houseplants. Here's what that means in practice, and what to do if it happens.

What should I do if my cat or dog eats a ZZ plant?

What makes the ZZ plant toxic?

Every part of the ZZ plant contains calcium oxalate crystals — microscopic, needle-shaped structures called raphides packed into the leaves, stems and rhizomes. When a pet or person chews the plant, those crystals are released and physically irritate whatever tissue they touch: the mouth, tongue and throat. The key distinction is that these are insoluble oxalate crystals: they cause local mechanical irritation rather than being absorbed into the bloodstream, so — unlike plants containing soluble oxalates — they aren't expected to cause kidney injury. Severe throat swelling that affects breathing can still rarely occur, which is why it's always treated as an emergency.

University of Florida's IFAS Extension notes the plant contains notably high levels of calcium oxalates, and the ASPCA lists the ZZ plant among the common insoluble-oxalate houseplants that can cause trouble for pets.

Is the ZZ plant toxic to cats?

Symptoms: drooling or foaming at the mouth, pawing at the face, oral pain, vomiting or retching, and loss of appetite.

What to do: gently check your cat's mouth for plant material, offer fresh water, and keep them calm and away from the plant. Contact your veterinarian to describe what happened, even if symptoms look mild.

When it's an emergency: difficulty breathing, significant swelling of the mouth or throat, repeated vomiting, or your cat can't swallow normally — these need urgent veterinary care, not a wait-and-see approach.

Is the ZZ plant toxic to dogs?

Symptoms: drooling, pawing at the mouth, oral irritation, and sometimes vomiting after chewing the leaves or stems.

What to do: remove access to the plant, offer water, and call your vet. How much was chewed and how sensitive your individual dog is both affect how they react, so it's worth getting professional advice rather than guessing.

When it's an emergency: as with cats, breathing difficulty or significant throat swelling means an emergency vet visit, not a wait-and-see approach.

Can a ZZ plant kill a cat or dog?

Typical ZZ plant exposure is not expected to be fatal. According to ASPCA guidance on insoluble-oxalate houseplants, severity is generally low and full recovery is expected without lasting effects. However, significant throat swelling and difficulty breathing can rarely occur, and those symptoms always warrant urgent veterinary attention rather than waiting it out at home.

Is a ZZ plant as dangerous as a lily to cats?

No — and this distinction matters, because "toxic plant" often makes cat owners think of lily poisoning specifically. True lilies (Lilium and Hemerocallis species, including Easter, tiger, and daylilies) can cause acute kidney failure in cats from a very small exposure — even brushing against pollen — and are frequently fatal if treatment is delayed. ZZ plants are a completely different category: their insoluble calcium oxalate crystals cause immediate, painful local irritation, not the kidney damage lilies cause. A ZZ plant still shouldn't be chewed, and the "what to do" steps above still apply — but it is not the same emergency as lily exposure.

Is the ZZ plant toxic to humans and children?

Ingestion: chewing the plant commonly causes immediate burning or irritation of the lips, mouth, tongue and throat. More significant swelling or difficulty swallowing requires medical advice — call Poison Control or your doctor rather than waiting to see how symptoms develop.

For skin and eye contact, see Is it safe to touch a ZZ plant? below.

What to do: rinse the mouth with water, offer something cool to drink, and contact Poison Control (in the US: 1-800-222-1222) or your doctor for guidance specific to what was ingested and by whom.

Which parts of a ZZ plant are toxic?

Treat the whole plant as toxic if chewed or ingested. UF/IFAS Extension notes the plant contains notably high levels of calcium oxalates, and Queensland's Poisons Information Centre specifically lists all parts of the plant as poisonous. In practice, there's no "safe" part to nibble on:

• Leaves
• Petioles (leaf stalks)
• Rhizomes (the thick underground stems)
• Sap released from any cut or damaged tissue

The concentration can vary between parts, but there's no reliable way to tell "how much is safe" — the standard is simple: don't eat any part of it, and keep cut or damaged pieces away from pets and kids.

Is it safe to touch a ZZ plant?

Simply having an intact ZZ plant in the room isn't a poisoning risk, and routine contact with undamaged foliage usually isn't a problem. The real concern is contact with plant material or sap, particularly from a cut or broken leaf or stem, which can irritate skin and eyes — Queensland's Poisons Information Centre specifically notes contact dermatitis can occur in sensitive people.

Wash your hands after pruning, repotting or propagating, and avoid touching your eyes or face until you have. If sap gets in your eyes, rinse thoroughly with water and seek medical advice if irritation persists.

How to keep a ZZ plant safely with pets and children

• Height helps. A high shelf, plant stand, or hanging spot keeps it out of reach of curious paws and hands.
• Redirect chewing. Cats often chew houseplants out of boredom or texture-seeking — offering cat grass gives them a safe alternative.
• Prune with gloves and clean up any dropped or trimmed leaves promptly so they aren't left within reach.
• Supervise little ones around houseplants generally, the same way you would with any object that shouldn't go in their mouth.

Pet-safe alternatives to ZZ plants

If pet safety is a priority in your home, plenty of popular houseplants are non-toxic to cats and dogs. A spider plant is one of the easiest — and safest — places to start. For more on keeping your ZZ plant itself healthy, see our ZZ plant problems and solutions guide, or learn how to propagate ZZ plants.

Frequently asked questions

Is a ZZ plant toxic to cats?

Yes. The ZZ plant contains calcium oxalate crystals that irritate a cat's mouth and throat if chewed, causing drooling, pawing at the face, and sometimes vomiting. Reactions are usually mild and resolve on their own, but you should still contact your vet, especially if your cat seems to be in ongoing discomfort.

What happens if a cat eats a ZZ plant?

Expect oral irritation — drooling, pawing at the mouth, and possible vomiting — soon after chewing. Most cats stop on their own because the reaction is unpleasant and immediate. Call your veterinarian to describe the exposure, and watch closely for breathing difficulty or significant swelling, which need urgent care.

Can a ZZ plant kill a cat?

It's very unlikely. Typical exposure causes mild, short-lived irritation rather than life-threatening poisoning. Serious complications like throat swelling severe enough to affect breathing are rare, but they do need emergency veterinary treatment if they occur — don't assume every exposure will resolve on its own without checking in.

Is a ZZ plant toxic to dogs?

Yes, in the same way it's toxic to cats. Chewing releases calcium oxalate crystals that irritate the mouth, causing drooling, pawing, and sometimes vomiting. How strongly a dog reacts depends on how much was chewed and the individual dog, so it's worth calling your vet rather than guessing at severity.

Are ZZ plants poisonous to humans?

Yes, mildly. Chewing or biting the plant causes burning or irritation in the mouth and throat from the same calcium oxalate crystals that affect pets. Serious poisoning is uncommon, but young children are more likely to put plant material in their mouths, so any suspected ingestion is worth a call to Poison Control.

Is it safe to touch a ZZ plant?

Yes — normal handling, dusting the leaves, or having it on a shelf is fine. The risk comes from sap released by a cut or damaged leaf or stem, which can irritate skin and eyes. Wash your hands after pruning or repotting, and avoid touching your face until you have.

Are ZZ plant leaves toxic?

Yes. The leaves contain the same calcium oxalate crystals found throughout the rest of the plant, and chewing or biting them causes the characteristic oral irritation in pets and people. Intact, undamaged leaves on a shelf pose no risk simply by being nearby — the danger is in chewing or crushing them.

Are ZZ plant roots and rhizomes toxic?

Yes. The thick rhizomes that store water underground contain calcium oxalate crystals just like the leaves and stems, so they're not safe to chew or eat either. Keep dug-up rhizomes — for example while repotting or propagating — out of reach of pets and children the same way you would the foliage.

Is Raven ZZ plant toxic too?

Yes. ‘Raven’ is simply a dark-leaved variety of the same species (Zamioculcas zamiifolia), so it contains the same calcium oxalate crystals and carries the same toxicity risk to cats, dogs and people as the standard green ZZ plant. All of the guidance on this page applies to it equally.

Written from a very crowded windowsill

Every guide here comes from things I've actually tried on my own plants. Got a plant doing something weird? Send me a photo — I answer every one.

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