Are Peace Lily Plants Poisonous? Key Facts & Safety Tips

By Emma Johnson · January 24, 2026

Yes, peace lily plants are poisonous to humans and pets when ingested. They contain calcium oxalate crystals that cause oral irritation, swelling, and difficulty swallowing. While rarely fatal, exposure requires prompt attention, especially in cats, dogs, and young children.

Understanding Peace Lily Toxicity

Peace lilies (Spathiphyllum spp.) are popular houseplants known for their lush green foliage and elegant white blooms. Despite their name, they are not true lilies but belong to the Araceae family. A common misconception is that they are safe due to their non-allergenic appearance, but they pose a real toxicity risk.

Why Are Peace Lilies Poisonous?

The primary toxic agent in peace lilies is calcium oxalate, found in the form of sharp, needle-like raphide crystals throughout the plant, especially in the leaves and stems. When chewed or bitten, these crystals penetrate soft tissues in the mouth and throat, causing immediate pain and inflammation.

Symptoms appear within minutes of ingestion or chewing
Toxicity affects both humans and animals
Severity depends on the amount consumed and the individual's size
No part of the plant is considered safe to eat

Symptoms of Peace Lily Poisoning

Exposure to peace lily sap or plant material can lead to a range of adverse reactions. Below is a breakdown of symptoms by affected group:

Symptom	Humans	Cats	Dogs	Onset Time
Oral irritation	Common	Very Common	Very Common	1–15 min
Swelling of mouth/lips	Moderate	Severe	Severe	5–30 min
Drooling	Rare	Very Common	Very Common	2–20 min
Vomiting	Possible	Common	Common	15–60 min
Difficulty swallowing	Yes	Yes	Yes	10–45 min
Lethargy	Rare	Common	Common	30+ min

Table data source:1, 2

The data shows that cats and dogs exhibit more severe and frequent symptoms than humans, particularly drooling and swelling. Onset is rapid—within minutes—highlighting the need for immediate intervention. While most cases are not life-threatening, veterinary or medical evaluation is recommended after exposure.

What to Do If Poisoning Is Suspected

Immediate action can reduce discomfort and prevent complications.

For Pets

If your cat or dog chews on a peace lily:

Rinse the mouth gently with water to remove plant particles
Offer a small amount of milk or water to soothe irritation
Contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435
Do not induce vomiting unless directed by a professional

For Humans

In case of ingestion or skin contact:

Rinse mouth thoroughly with water
Wash skin with soap and water if sap causes irritation
Drink milk or soothing liquids to ease throat discomfort
Call Poison Control at (800) 222-1222 if symptoms persist or worsen

Are All Spathiphyllum Varieties Toxic?

Yes. All cultivars of Spathiphyllum, including 'Clevelandii', 'Sensation', 'Domino', and 'Petite', contain calcium oxalate crystals. The concentration may vary slightly, but no variety is considered non-toxic. Regardless of size or appearance, treat all peace lilies as potentially harmful if ingested.

Safe Alternatives to Peace Lilies

If you have curious pets or small children, consider non-toxic houseplants such as:

Spider Plant (Chlorophytum comosum): Easy to grow, air-purifying, and completely safe
Parlor Palm (Chamaedorea elegans): Low-light tolerant and pet-friendly
Boston Fern (Nephrolepis exaltata): Humidifier-like effect and non-toxic
Peperomia spp.: Compact, decorative, and safe around pets

Preventing Accidental Exposure

Proactive placement and supervision can minimize risks:

Place peace lilies on high shelves or hanging planters out of reach
Avoid locations near pet feeding areas or children’s play zones
Use bitter-tasting deterrent sprays for pets (e.g., Grannick’s Bitter Apple)
Label toxic plants clearly for caregivers or visitors

Frequently Asked Questions About Peace Lily Toxicity

Are peace lily plants poisonous to cats?

Yes, peace lilies are toxic to cats. Chewing the leaves releases calcium oxalate crystals that cause intense oral pain, drooling, vomiting, and difficulty swallowing. While rarely fatal, veterinary care may be needed to manage symptoms.

Can peace lily poisoning be fatal?

Death from peace lily ingestion is extremely rare in humans and pets. However, severe swelling of the airway could theoretically obstruct breathing. Most cases result in temporary discomfort and resolve with supportive care.

Is it safe to have a peace lily with dogs?

You can keep a peace lily with dogs if it's placed out of reach. Dogs that chew the plant will experience mouth irritation and vomiting. Choose pet-safe alternatives if your dog is prone to eating houseplants.

Does touching a peace lily cause poisoning?

Skin contact may cause mild irritation or rash in sensitive individuals due to the sap. Washing hands after handling is recommended. The greatest risk comes from ingestion, not touch.

How is peace lily poisoning treated?

Treatment involves rinsing the mouth, offering cool liquids, and managing symptoms. In pets, vets may administer antihistamines or anti-inflammatories. Severe cases may require medical supervision, but hospitalization is uncommon.

Final Thoughts

While peace lilies enhance indoor air quality and aesthetics, their toxicity to humans and pets must be taken seriously. By understanding the risks, recognizing symptoms early, and taking preventive steps, you can enjoy this beautiful plant safely. For households with pets or young children, opting for non-toxic alternatives is a wise and responsible choice.