Is Spathiphyllum Poisonous? Safety Guide for Homeowners

By Sophia Martinez · January 24, 2026

Yes, spathiphyllum (peace lily) is poisonous to humans and pets due to calcium oxalate crystals in its leaves and stems. Ingestion can cause oral irritation, swelling, and gastrointestinal distress. Keep out of reach of children and animals.

Understanding Spathiphyllum Toxicity

Spathiphyllum, commonly known as the peace lily, is a popular houseplant prized for its lush foliage and air-purifying qualities. However, it contains insoluble calcium oxalate crystals, which are toxic when ingested. These needle-like crystals can cause immediate pain and irritation upon contact with the mouth, throat, and digestive tract.

How Poisonous Is Spathiphyllum?

The toxicity level of peace lily is considered mild to moderate. While not usually fatal, symptoms can be uncomfortable and alarming, especially in small children or pets. The plant’s defense mechanism involves releasing these crystals when chewed, leading to rapid onset of discomfort.

Immediate burning sensation in the mouth and tongue
Swelling of lips, tongue, and throat
Drooling and difficulty swallowing
Nausea, vomiting, or diarrhea
Rarely, respiratory distress if swelling is severe

Pets and Spathiphyllum: A Dangerous Combination

Cats and dogs are particularly vulnerable to peace lily poisoning. Curious pets may chew on the leaves, triggering an acute reaction. According to the ASPCA, spathiphyllum is listed as toxic to both cats and dogs.

Symptoms in Pets

Pawing at the mouth or face
Vomiting and excessive drooling
Loss of appetite
Difficulty breathing in severe cases

Species	Toxic Component	Common Symptoms	Severity Level	Treatment Required?
Humans (adults)	Calcium oxalate crystals	Mouth irritation, nausea	Mild	Usually not; rinse mouth, drink water
Children (under 5)	Calcium oxalate crystals	Swelling, drooling, vomiting	Moderate	Possible medical evaluation
Cats	Calcium oxalate crystals	Drooling, vomiting, lethargy	Moderate to Severe	Yes – veterinary care
Dogs	Calcium oxalate crystals	Oral irritation, GI upset	Moderate	Often required
Birds	Calcium oxalate crystals	Respiratory distress, vomiting	Severe	Immediate treatment needed

Table data source:1, 2

The table shows that while all species experience similar toxic mechanisms, severity varies significantly. Birds and cats face higher risks due to smaller body size and sensitivity. Immediate response is crucial for pets, whereas humans typically recover with basic first aid.

What to Do If Poisoning Occurs

If someone ingests part of a peace lily, act quickly but calmly:

For Humans

Rinse the mouth thoroughly with water
Drink milk or water to dilute toxins
Avoid inducing vomiting unless directed by a professional
Contact poison control (1-800-222-1222 in the U.S.)

For Pets

Wipe mouth gently with a damp cloth
Offer water to drink
Contact your veterinarian or animal poison control immediately
Do not administer any medication without guidance

Safe Alternatives to Spathiphyllum

If you have young children or pets, consider non-toxic houseplants that offer similar aesthetic and air-purifying benefits:

Chlorophytum comosum (Spider Plant) – Safe, easy to grow, purifies air
Phalaenopsis (Moth Orchid) – Non-toxic, elegant blooms
Nephrolepis exaltata (Boston Fern) – Pet-safe and humidity-loving
Pilea peperomioides (Chinese Money Plant) – Trendy and non-toxic
Calathea spp. – Safe, colorful foliage, thrives indoors

Frequently Asked Questions About Spathiphyllum Poisoning

Are peace lilies poisonous to touch?

Generally, no. The calcium oxalate crystals are primarily harmful when ingested. However, sensitive individuals may experience mild skin irritation after handling the sap, especially if they have cuts or allergies. Wearing gloves during pruning is recommended.

Can peace lily cause breathing problems?

Yes, in rare cases. Severe swelling of the tongue or throat after ingestion can obstruct airways, especially in small children or pets. Seek emergency medical help if breathing becomes difficult.

Is it safe to have a peace lily with cats?

No, it is not safe. Cats are highly susceptible to peace lily toxicity. Even minor chewing can lead to significant discomfort and health risks. It's best to choose cat-safe plants like spider plants or Boston ferns instead.

What parts of the peace lily are poisonous?

All parts of the plant contain calcium oxalate crystals, but the leaves and stems are most commonly involved in exposure. The roots and flowers also pose a risk if ingested.

How fast do symptoms appear after ingestion?

Symptoms typically begin within minutes of chewing or swallowing any part of the plant. Immediate burning, drooling, and pawing at the mouth are common early signs in both humans and pets.

Conclusion

While spathiphyllum is an excellent indoor plant for improving air quality and adding greenery, its toxicity should not be overlooked. It poses real risks to children and pets due to calcium oxalate crystals. With proper placement and awareness—or by choosing safer alternatives—you can enjoy beautiful houseplants without compromising safety.