Is Taro Poisonous? – Toxicity to Humans, Dogs, and Cats

Taro is poisonous. All parts of the raw plant contain calcium oxalate crystals that cause immediate oral irritation in humans, dogs, and cats. The good news: symptoms are usually uncomfortable rather than dangerous, and cooking taro root destroys enough of the crystalline structure to make it safe to eat.

Which Taro Species Are We Talking About?

Two very different plants share the name “taro,” and both matter when it comes to toxicity.

Taro / elephant ear (Colocasia esculenta) is the plant grown for its edible root. The starchy tuber you find at the grocery store is taro root, but only after cooking. The raw version is toxic.

Taro Vine / Devil’s Ivy (Epipremnum aureum) is a common houseplant also known as pothos. It looks nothing like the elephant ear plant, but it shares the same toxic principle. If you have this on a high shelf to keep it away from your cat, that shelf exists for a reason.

Both plants are toxic when eaten raw. The rest of this article covers both species.

The Toxic Principle: Calcium Oxalate Crystals

The culprit is a substance called insoluble calcium oxalate crystals. These are tiny, needle-shaped structures that live inside the plant’s cells. When something chews through the plant, the cells rupture and the crystals are released.

These crystals do exactly what their shape suggests: they pierce soft tissue on contact. The result is immediate burning and irritation of the mouth, tongue, and throat. Unlike some toxins that require absorption to cause harm, this works on contact.

Cooking does not eliminate calcium oxalate from the plant entirely, but it destroys enough cellular structure that the crystals become far less reactive. That is why thoroughly cooked taro root is a food and raw taro is not.

Which Parts Are Toxic?

All raw parts of the plant contain calcium oxalate crystals.

• Leaves and stems: the parts most commonly ingested by pets
• Corms and tubers: the underground storage roots; toxic raw, safe cooked
• Taro vine / pothos vines: the trailing stems are the primary danger in houseplants

The edible taro root (Colocasia esculenta) is safe only after thorough cooking. Even then, some residual oxalate sensitivity can affect people prone to kidney stones. Everyone else can enjoy it without worry.

Symptoms in Dogs and Cats

Dogs and cats are both vulnerable. The symptoms are unpleasant but, in most cases, not life-threatening.

Watch for:

• Pawing at the mouth
• Drooling or excessive salivation
• Oral irritation: tongue swelling, lip licking
• Vomiting
• Difficulty swallowing
• Reduced appetite for a day or two after ingestion

The severity depends on how much the animal ate. A single bite of a leaf will produce noticeable irritation. Eating a larger quantity may cause more pronounced vomiting and distress.

Cats tend to be more sensitive relative to their size, but the overall clinical picture is similar to dogs.

Symptoms in Humans

If an adult handles or ingests raw taro, the symptoms are uncomfortable but usually mild:

• Immediate burning sensation in the mouth and on the lips
• Tongue and throat irritation
• Stomach upset if swallowed
• Skin redness and itching after handling raw plant material (dermatitis)

Children are at higher risk simply because they are more likely to put plant parts in their mouths. Pets face greater risk than adults because of their smaller body size and their inability to understand that the plant is causing the pain.

What to Do If Taro Is Eaten

If your pet eats raw taro:

Do not induce vomiting. The calcium oxalate crystals have already done damage inside the mouth. Forcing them back up the esophagus adds a second pass of tissue damage.

Instead:

1. Rinse your pet’s mouth with plain water if they will allow it
2. Call your veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435
3. Monitor for breathing difficulty. Swelling of the throat is rare but possible and requires immediate emergency care
4. Bring a photo or sample of the plant to the vet if instructed to visit

For humans who have ingested raw taro: rinse the mouth with water, drink milk or water to ease throat irritation, and call your local poison control center. Most cases resolve on their own within a few hours.

Safe Handling

Wear gloves when working with raw taro root or cutting the elephant ear plant. The irritation from skin contact is not dangerous but it is unpleasant.

After handling, wash your hands thoroughly with soap and water. Do not touch your eyes or face while working with the raw plant.

For pet owners with Epipremnum aureum in the home: place the plant out of reach. High shelves and hanging planters work, but know that determined cats have climbed shelves that seemed perfectly safe. If your pet has already eaten pothos, treat it the same way you would taro.

FAQ

Can dogs eat cooked taro root? Yes, plain cooked taro root is generally safe for dogs in small amounts. It is starchy and not toxic when cooked. Avoid any added seasonings, fats, or ingredients.

Is taro vine the same as pothos? Yes. Taro vine (Epipremnum aureum) is the plant commonly sold as pothos or Devil’s Ivy. It is toxic in its raw form, just like the outdoor elephant ear plant.

Will one bite kill a cat? Almost certainly not. One bite causes oral irritation and discomfort, which is distressing to watch but rarely dangerous. The bigger risk is a large quantity ingestion causing severe vomiting and dehydration. Always call your vet to be safe.

Can I grow taro indoors safely? You can grow Colocasia esculenta indoors if you keep it away from pets and children. Wear gloves when handling it. Alternatively, choose non-toxic houseplants in areas accessible to pets.