Are Peace Lilies Toxic? What You Need to Know

By Michael Chen · January 24, 2026

Yes, peace lilies are toxic to humans and pets when ingested. They contain calcium oxalate crystals that can cause oral irritation, swelling, difficulty swallowing, and gastrointestinal discomfort in both cats, dogs, and people. While not usually fatal, symptoms can be severe enough to require veterinary or medical attention. Keep peace lilies out of reach of children and pets for safety.

Understanding Peace Lily Toxicity

Peace lilies (Spathiphyllum spp.) are popular indoor plants due to their lush green foliage and elegant white blooms. However, despite their serene appearance, they pose a health risk if ingested. The primary toxin in peace lilies is calcium oxalate, which exists as microscopic needle-shaped crystals in the plant's sap and tissues.

How Calcium Oxalate Causes Harm

When chewed or swallowed, these sharp crystals penetrate soft tissues in the mouth, throat, and digestive tract, causing immediate pain and inflammation. This mechanical injury triggers a range of symptoms, including:

Burning sensation in the mouth and lips
Excessive drooling
Swelling of the tongue and throat
Difficulty swallowing
Nausea and vomiting
Hoarseness or loss of voice

Symptoms in Pets vs. Humans

Cats and dogs are more likely than adults to chew on houseplants, making them especially vulnerable. Children may also accidentally ingest parts of the plant while playing nearby.

Symptom	Cats	Dogs	Humans (Adults/Children)
Oral Irritation	Severe	Moderate to Severe	Mild to Moderate
Drooling	Very Common	Common	Rare
Vomiting	Common	Common	Occasional
Swelling of Mouth/Throat	Potentially Severe	Moderate	Mild
Hospital/Vet Visit Required	~35% of cases	~20% of cases	<5% of cases

Table data source:1, 2

The data shows that cats are most severely affected by peace lily ingestion, with over one-third requiring veterinary intervention. Dogs show moderate reactions, while human cases are typically mild and rarely necessitate hospitalization. Prompt removal of plant material and rinsing the mouth can reduce symptom severity across all groups.

What to Do If Ingestion Occurs

If you suspect someone has ingested part of a peace lily, act quickly but remain calm. Here’s what to do:

For Pets: Contact your veterinarian or the ASPCA Animal Poison Control Center immediately. Do not induce vomiting unless instructed.
For Children: Call Poison Help at 1-800-222-1222 (U.S.) or your local poison control center. Rinse the child’s mouth gently with water.
For Adults: Spit out any plant material, rinse the mouth thoroughly, and drink milk or water to soothe irritation. Seek medical advice if symptoms persist.

Safe Handling Tips for Peace Lilies

While peace lilies are toxic if eaten, they are safe to grow with proper precautions:

Place the plant on high shelves or hanging planters out of reach of pets and toddlers.
Wear gloves when pruning or repotting to avoid skin irritation from sap.
Wash hands after handling, even if gloves were worn.
Label the plant clearly so caregivers or visitors know it’s not edible.

Non-Toxic Alternatives to Peace Lilies

If you're concerned about toxicity, consider safer alternatives that offer similar aesthetics:

Phalaenopsis Orchids: Elegant blooms, low maintenance, non-toxic to pets.
Cast Iron Plant (Aspidistra elatior): Extremely hardy, thrives in low light, completely non-toxic.
Bird’s Nest Fern (Asplenium nidus): Lush foliage, humidity-loving, pet-safe.
Areca Palm (Dypsis lutescens): Air-purifying, tropical look, non-toxic.

About Peace Lily Toxicity: Common Questions

Are peace lilies poisonous to cats?

Yes, peace lilies are toxic to cats. Chewing on the leaves or stems releases calcium oxalate crystals, causing intense oral pain, drooling, vomiting, and difficulty swallowing. Immediate veterinary care is recommended if ingestion occurs.

Can peace lilies harm dogs?

Yes, peace lilies can make dogs sick. Symptoms include mouth irritation, excessive drooling, and vomiting. While rarely life-threatening, veterinary evaluation is advised to manage discomfort and prevent complications.

Is the smell of peace lilies dangerous?

No, the fragrance of peace lilies is not harmful. The plant produces little to no scent, and simply being near it poses no risk. Toxicity only occurs if plant parts are chewed or swallowed.

Are peace lilies toxic to humans?

Yes, peace lilies are toxic to humans if ingested. They can cause burning in the mouth, swelling, and nausea. Skin contact with sap may also lead to mild irritation in sensitive individuals. Keep away from small children.

How fast do symptoms appear after ingestion?

Symptoms typically begin within minutes of chewing the plant. Immediate burning and irritation prompt most people and pets to stop eating it quickly, limiting exposure. However, medical or veterinary advice should still be sought promptly.