Plants Toxic to Cats and Dogs39 Houseplants and Their ASPCA Listings

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This toxic plant directory is a clear list of which houseplants are actually dangerous, at what severity, and to which animals — written plainly, with citations you can follow. It also answers a common question: how do you keep toxic plants in a home with a cat? You assess the risk, you manage the placement (a plant such as pothos goes on a shelf the cat genuinely cannot reach), and you know exactly what to call if something goes wrong.

Single-plant answers, each with the ASPCA entry, the signs it lists and what to do if a pet chews the plant: snake plant, pothos, monstera, peace lily, aloe and poinsettia.

Most "toxic plants" roundups either catastrophize everything or barely scratch the surface. This directory covers the plants most commonly sold as houseplants, organized by severity. The life-threatening tier is short but critical: three species that can kill a cat or dog even with treatment. The moderate and mild tiers are longer and, frankly, more livable with.

What "toxic" actually means — and what it doesn't

The ASPCA Toxic and Non-Toxic Plants database is the authoritative reference for household plant toxicity in pets. It's maintained by the ASPCA Animal Poison Control Center (APCC), which handles hundreds of thousands of cases a year (401,550 animals in 2021, per the ASPCA) and updates classifications based on clinical outcomes. In this directory, "toxic" means the ASPCA (or a recognized veterinary fallback source) has classified a plant as such.

"Toxic" covers a wide range. At the severe end, Sago Palm and Easter Lily can cause life-threatening organ failure. At the mild end, Poinsettia — legendary for its supposed danger — causes mainly minor mouth irritation and has been described by the ASPCA itself as "generally over-rated in toxicity." The same word, very different outcomes.

A few distinctions that matter:

Toxic does not mean impossible to live with. Plenty of pet owners keep pothos, snake plants, dieffenbachia, and monstera with cats and dogs. The question is management: can you keep it genuinely out of reach? A trailing pothos in a hanging planter well out of reach is a different situation than a floor-level pothos in a kitten household.

Non-toxic does not mean harmless. Any plant material consumed in volume can cause gastrointestinal upset. The ASPCA is explicit about this: "non-toxic" means no serious systemic toxicity is expected, not that your cat can freely graze. Spider plants, Boston ferns, and calatheas are all "non-toxic" — and all capable of causing vomiting if a bored pet eats a large handful.

Severity varies by species, size, and amount ingested. A large dog chewing a poinsettia leaf is a very different situation than a kitten that gets into the vase water from a true lily arrangement. Size matters. Species matters. Amount matters.

The three life-threatening species — what every cat owner must know

This is not a complete list of dangerous plants. But these three species are categorically different from everything else in this directory: they can kill even with immediate treatment, and the margin between exposure and crisis is small.

Easter Lily and true lilies (Lilium spp., Hemerocallis spp.) are the most urgent. In cats — and only cats, dogs appear unaffected — even a tiny exposure to any part of a true lily causes acute kidney failure within 24–72 hours, per the FDA. "Any part" is not an exaggeration: pollen on the fur that a cat grooms off, water from the vase, a single bitten leaf. The toxic compound is unknown, which is part of what makes it so scary — there is no specific antidote. Treatment is aggressive IV fluid therapy to flush the kidneys before permanent damage sets in. The window is short. If you have cats, true lilies should not be in your home, full stop.

Sago Palm (Cycas revoluta) contains cycasin, which causes acute hepatic (liver) failure in dogs, cats, and horses. All parts are toxic; the seeds contain the highest concentration. Liver failure from Sago Palm often progresses even with aggressive hospital treatment — survival rates vary but can be poor. This plant is increasingly popular as a decorative indoor or patio specimen, which is a problem. If you have pets, Sago Palm is a plant to avoid entirely.

Oleander (Nerium oleander) contains cardiac glycosides that disrupt heart rhythm. Arrhythmias, low blood pressure, and cardiovascular collapse are all possible outcomes. Toxic to cats, dogs, and horses. Even dried clippings retain toxicity. Oleander is primarily an outdoor/landscape plant in mild climates but does appear as a potted indoor specimen.

All three of these are emergency situations. The number to call is the ASPCA Animal Poison Control Center: (888) 426-4435. Note that a consultation fee applies, but do not let that delay the call.

The honest tradeoffs for common toxic houseplants

Below the life-threatening tier, the calculus gets more nuanced. Here's how it plays out for a few common houseplants:

Pothos (Epipremnum aureum): Moderate severity via insoluble calcium oxalates. Causes oral irritation, drooling, vomiting if chewed. Painful but not life-threatening in typical exposures. If you keep pothos, put it on a high shelf, away from any surface a cat can reach or jump to. If you have a kitten, a dog that counter-surfs, or a cat that genuinely climbs everything, think harder about it.

Peace Lily (Spathiphyllum): Same calcium oxalate mechanism as pothos, moderate severity. It's one of the most-given houseplant gifts and one of the most commonly misidentified as "fine" because it sounds peaceful. It is not the same as Easter Lily and is not life-threatening to cats, but it will cause significant oral irritation if chewed. Keep elevated or choose a different plant.

Snake Plant (Sansevieria trifasciata): ASPCA lists this as toxic via saponins, with clinical signs of nausea, vomiting, and diarrhea. Keep it on a high shelf, out of reach.

Dieffenbachia: Moderate severity, calcium oxalates plus proteolytic enzymes. The common name "dumbcane" comes from the plant's ability to cause temporary speech loss in humans who chew it — the same burning, swelling effect occurs in pets. Keep well out of reach.

Jade Plant: Vomiting, depression, incoordination. ASPCA classifies it as toxic to cats, dogs, and horses, though the toxic compound is listed as "unknown." Medium-traffic succulent in a lot of households. Keep elevated.

The directory below gives you the full data.

FAQ

Is pothos safe enough if I keep it out of reach?

That depends on your specific pet and your specific setup. For a lazy indoor cat or a dog with no interest in plants, a pothos on a high shelf the pet cannot reach is a reasonable risk management strategy — the plant causes oral irritation rather than organ failure, and actual ingestion requires contact with the leaves. For a kitten or a dog that climbs or counter-surfs aggressively, the risk is higher than most people realize. There's no universal answer, but "out of reach" needs to be genuinely out of reach, not just "on a high enough table."

Is Peace Lily the same as Easter Lily? Are they equally dangerous?

No — and this is one of the most important distinctions in the entire directory. Peace Lily is Spathiphyllum, an aroid with no relation to true lilies. It causes oral irritation and GI upset via calcium oxalates — moderately toxic but not organ-threatening. Easter Lily is Lilium longiflorum, a true lily that can cause acute kidney failure in cats within 24–72 hours, per the FDA. They share a common name component but nothing else. If you have cats, Peace Lily is a "manage it carefully" plant. Easter Lily is a "never bring into the house" plant.

My cat ate a leaf from a toxic plant. What do I do right now?

Call the ASPCA Animal Poison Control Center immediately: (888) 426-4435. A consultation fee applies. Have ready: the plant name (common and scientific if you know it), an estimate of how much was ingested, and your pet's weight. Do not induce vomiting unless explicitly instructed by a veterinarian — for some toxins, inducing vomiting makes things worse. If your cat is showing symptoms (drooling, vomiting, lethargy, difficulty swallowing), go to an emergency vet now and call poison control on the way.

Sources

• ASPCA Toxic and Non-Toxic Plants database (primary)
• ASPCA Animal Poison Control Center — (888) 426-4435
• NC State Extension Plant Toolbox (fallback for plants without ASPCA entries)
• University of Illinois Veterinary Medicine Poisonous Plant Garden (fallback)
• U.S. Food and Drug Administration — Lovely Lilies and Curious Cats: A Dangerous Combination
• ASPCA press release — Animal Poison Control Center reaches 4 million cases
• Missouri Botanical Garden Plant Finder (fallback)

This directory is general information, not veterinary advice. See our full disclaimer for details.