10 Popular Houseplants That Are Toxic to Cats (With Safe Alternatives)

Your Instagram-worthy houseplant collection could be putting your cat in danger. According to the ASPCA Animal Poison Control Center, plant ingestion is one of the top reasons cats are brought to emergency veterinary clinics.

This vet-reviewed guide covers the 10 most popular houseplants that are toxic to cats, what happens if your cat eats them, and beautiful pet-safe alternatives you can swap in.

The 10 Most Common Toxic Houseplants for Cats

1. Lilies (Lilium & Hemerocallis species)

Danger Level: EXTREME — potentially fatal

Lilies are the #1 most dangerous plant for cats. Every part of the plant is toxic — flowers, leaves, stems, pollen, and even the water in the vase. Ingesting even a tiny amount can cause fatal acute kidney failure within 24-72 hours.

• Symptoms: Vomiting, loss of appetite, lethargy, kidney failure, death
• Timeline: Vomiting within 2 hours, kidney failure within 24-72 hours
• Safe alternative: Orchids (Phalaenopsis) — equally elegant, completely non-toxic

2. Sago Palm (Cycas revoluta)

Danger Level: EXTREME — potentially fatal

All parts of the sago palm are toxic, but the seeds (nuts) contain the highest concentration of cycasin. Ingestion can cause liver failure and death even with treatment.

• Symptoms: Vomiting, diarrhea, seizures, liver failure
• Toxic compound: Cycasin
• Safe alternative: Parlor palm (Chamaedorea elegans) — similar tropical look, non-toxic

3. Pothos / Devil's Ivy (Epipremnum aureum)

Danger Level: MODERATE

One of the most popular houseplants worldwide, pothos contains calcium oxalate crystals that cause immediate oral pain and irritation when chewed.

• Symptoms: Intense oral burning, drooling, vomiting, difficulty swallowing
• Toxic compound: Insoluble calcium oxalate crystals
• Safe alternative: Spider plant (Chlorophytum comosum) — trailing habit, easy care, non-toxic

4. Monstera (Monstera deliciosa)

Danger Level: MODERATE

The trendy Swiss cheese plant contains the same calcium oxalate crystals as pothos. While rarely life-threatening, it causes painful irritation.

• Symptoms: Oral pain, swelling, drooling, vomiting
• Safe alternative: Calathea (various species) — dramatic leaves, cat-safe

5. Dieffenbachia (Dumb Cane)

Danger Level: MODERATE to HIGH

Named "dumb cane" because chewing it can cause temporary inability to speak in humans. In cats, it causes severe oral irritation and can lead to dangerous swelling of the airway.

• Symptoms: Intense oral burning, tongue swelling, drooling, difficulty breathing
• Safe alternative: Cast iron plant (Aspidistra elatior) — tough, low-light, non-toxic

6. Aglaonema (Chinese Evergreen)

Danger Level: MODERATE

Another calcium oxalate plant. Popular for low-light conditions but dangerous if your cat is a chewer.

• Symptoms: Oral irritation, drooling, vomiting, difficulty swallowing
• Safe alternative: Peperomia (various species) — similar compact form, non-toxic

7. Tradescantia (Inch Plant / Wandering Dude)

Danger Level: LOW to MODERATE

Tradescantia species can cause contact dermatitis (skin irritation) in cats and dogs, and GI upset if ingested. Tradescantia zebrina is the most commonly reported.

• Symptoms: Skin redness, itching, dermatitis, vomiting if ingested
• Safe alternative: String of hearts (Ceropegia woodii) — trailing, pet-safe

8. Kalanchoe (Flaming Katy)

Danger Level: MODERATE to HIGH

Kalanchoe contains bufadienolides — cardiac glycosides that can affect the heart. Flowering varieties are especially popular gift plants.

• Symptoms: Vomiting, diarrhea, abnormal heart rhythm
• Toxic compound: Bufadienolides (cardiac glycosides)
• Safe alternative: African violet (Saintpaulia) — colorful flowers, completely safe

9. Aloe Vera

Danger Level: LOW to MODERATE

While aloe gel is safe for humans, the latex layer (yellow substance under the skin) contains anthraquinones that are toxic to cats and dogs.

• Symptoms: Vomiting, diarrhea, lethargy, tremors
• Toxic compound: Saponins and anthraquinones
• Safe alternative: Haworthia — looks similar to aloe, completely non-toxic

10. Philodendron (various species)

Danger Level: MODERATE

All philodendron species contain calcium oxalate crystals. Heartleaf philodendron is one of the most common houseplants and a frequent cause of cat poisoning.

• Symptoms: Oral irritation, swelling, drooling, vomiting
• Safe alternative: Boston fern (Nephrolepis exaltata) — lush and green, cat-safe

Complete List of Cat-Safe Houseplants

You don't have to give up plants entirely. These popular houseplants are verified non-toxic to cats by the ASPCA:

• Spider Plant (Chlorophytum comosum) — Easy, trailing, air-purifying
• Boston Fern (Nephrolepis exaltata) — Lush, humidity-loving
• Calathea (various) — Dramatic patterned leaves
• Peperomia (various) — Compact, diverse varieties
• African Violet (Saintpaulia) — Colorful blooms indoors
• Cast Iron Plant (Aspidistra elatior) — Nearly indestructible
• Parlor Palm (Chamaedorea elegans) — Tropical without the toxicity
• Ponytail Palm (Beaucarnea recurvata) — Unique shape, very hardy
• Polka Dot Plant (Hypoestes phyllostachya) — Colorful foliage
• Haworthia — Succulent, aloe-lookalike, non-toxic

What to Do If Your Cat Eats a Toxic Plant

1. Remove the plant from your cat's reach immediately
2. Check your cat's mouth for plant material and gently rinse if safe to do so
3. Identify the plant — take a photo or bring a sample to the vet
4. Call your vet or poison control — ASPCA (888-426-4435) or Pet Poison Helpline (855-764-7661)
5. Do NOT induce vomiting unless specifically instructed by a professional
6. Monitor for symptoms and note the time your cat ate the plant

Prevention Tips

• Scan all plants with ToxiPets before bringing them home
• Place toxic plants in rooms your cat can't access (if you must keep them)
• Use hanging planters well out of reach — but remember cats are excellent climbers
• Provide cat grass (wheatgrass) as a safe chewing alternative
• Consider bitter spray deterrents on plant leaves

Use ToxiPets to scan any plant — just point your camera and get an instant safety verdict for your cat or dog.