Is the Peace Lily Plant Poisonous? Key Facts

By Rachel Green · May 10, 2025

Yes, the peace lily plant is poisonous to humans and pets if ingested. It contains calcium oxalate crystals that cause irritation of the mouth, swelling, difficulty swallowing, and gastrointestinal upset. While rarely fatal, it requires prompt attention.

Understanding Peace Lily Toxicity

The peace lily (Spathiphyllum spp.) is a popular houseplant due to its lush foliage and air-purifying qualities. However, all parts of the plant—leaves, stems, flowers, and roots—contain microscopic calcium oxalate crystals. When chewed or swallowed, these needle-like crystals penetrate soft tissues, triggering immediate pain and inflammation.

Symptoms in Humans

Oral irritation, burning sensation in the mouth and tongue
Swelling of lips, tongue, and throat
Excessive drooling
Nausea and vomiting
Difficulty swallowing

Symptoms in Pets

Pawing at the mouth
Drooling
Vomiting
Loss of appetite
Depression or lethargy (especially in cats and dogs)

Scientific Basis of Toxicity

Calcium oxalate is a naturally occurring compound in many plants, serving as a defense mechanism against herbivores. In peace lilies, these crystals are housed in specialized cells called idioblasts. When damaged, the crystals are released, causing mechanical and chemical irritation.

Species	Toxic Part	Symptom Onset	Severity	Treatment Required?
Humans (adults)	All parts	Immediate (seconds–minutes)	Mild to moderate	Rinsing, medical advice if severe
Children	All parts	Immediate	Moderate (risk of airway swelling)	Medical evaluation recommended
Cats	All parts	Within minutes	Moderate to severe	Veterinary care needed
Dogs	All parts	Within minutes	Moderate	Vet consultation advised
Birds	All parts	Rapid	Severe	Emergency treatment required

Table data source:1, 2

The data shows that while peace lily toxicity is generally non-lethal, symptom onset is rapid across species due to the physical action of calcium oxalate crystals. Birds and cats are at higher risk for severe reactions, necessitating urgent intervention. Even small ingestions can lead to significant discomfort, emphasizing preventive measures.

Safety Tips for Households with Peace Lilies

Preventive Measures

Place peace lilies out of reach of children and pets, such as on high shelves or hanging planters.
Use bitter-tasting plant sprays to deter chewing.
Wear gloves when pruning to avoid skin irritation.
Wash hands thoroughly after handling the plant.
Teach children not to touch or taste houseplants.

What to Do If Ingestion Occurs

Rinse the mouth gently with water.
Offer milk or yogurt to soothe irritation (for conscious individuals).
Contact Poison Control (US: 1-800-222-1222) or a veterinarian immediately.
Do not induce vomiting unless instructed by a professional.

Frequently Asked Questions About Peace Lily Toxicity

Is the peace lily toxic to cats?

Yes, peace lilies are toxic to cats. Ingestion causes oral pain, drooling, vomiting, and difficulty swallowing. Cats may become lethargic. Immediate veterinary care is recommended.

Are peace lilies dangerous for dogs?

Yes, peace lilies pose a risk to dogs. While not usually fatal, they can cause significant mouth irritation, nausea, and vomiting. Contact your vet if your dog chews on any part of the plant.

Can touching a peace lily make you sick?

Direct contact can cause skin irritation or dermatitis in sensitive individuals due to calcium oxalate sap. Always wear gloves when handling and wash hands afterward.

Is the peace lily flower poisonous too?

Yes, the flowers, like all parts of the peace lily, contain calcium oxalate crystals and are poisonous if ingested by humans or animals.

How much peace lily is dangerous to eat?

Even small amounts can trigger symptoms due to the potency of calcium oxalate. A single leaf chewed by a cat or child can cause significant discomfort. The severity depends on body weight and sensitivity.

Conclusion

The peace lily is a beautiful and beneficial indoor plant, but its toxicity should not be overlooked. With proper placement and awareness, it can coexist safely in homes with children and pets. Always act quickly if ingestion occurs and consult professionals for guidance. Awareness and prevention are key to enjoying this plant responsibly.