Is It Poisonous
Toxic

Genuinely dangerous if eaten. Treat any ingestion seriously.

Is Dieffenbachia Poisonous? – Toxicity to Pets and Humans

PlantsDogsCatsChildren By Hannah Reeve · Researched and fact-checked against ASPCA and poison-control sources

Dieffenbachia is toxic to dogs, cats, and humans. The plant contains two irritants working together: insoluble calcium oxalate crystals and a proteolytic enzyme. Together they cause intense burning and swelling of the mouth and throat that can make swallowing difficult and, in humans, may temporarily impair speech. The common name “dumb cane” reflects this effect.

The ASPCA lists dieffenbachia as toxic to dogs and cats, with insoluble calcium oxalates and a proteolytic enzyme as the toxic principles.

What Part of Dieffenbachia Is Toxic?

All parts of the plant contain the irritants: leaves, stems, and sap. The sap is the most concentrated source and is released whenever a leaf or stem is broken or cut.

The calcium oxalate crystals cause mechanical irritation by piercing soft tissue. The proteolytic enzyme compounds this by breaking down proteins in the tissue, producing more intense inflammation than calcium oxalates alone. This combination makes dieffenbachia more irritating than many other oxalate-containing houseplants such as devil’s ivy or peace lily.

Symptoms of Dieffenbachia Ingestion

Dogs and cats

  • Immediate oral pain and pawing at the face
  • Intense drooling
  • Burning and swelling of mouth, tongue, and lips
  • Vomiting
  • Difficulty swallowing
  • Reduced appetite that may persist for several days while oral irritation resolves

Serious systemic toxicity is uncommon. The intense immediate pain typically stops the animal from consuming more.

Humans and children

  • Intense burning and tingling in the mouth and throat on contact
  • Swelling of the tongue and lips
  • Difficulty speaking (temporary; this is the origin of the “dumb cane” common name)
  • Difficulty swallowing
  • Nausea and vomiting
  • Skin irritation or rash from sap contact
  • Eye pain if sap enters the eyes

In rare cases with significant ingestion, throat swelling can become severe enough to require medical attention. Young children who chew on the leaves are at highest risk.

What to Do

  1. Remove any remaining plant material from the mouth.
  2. Rinse the mouth thoroughly with cool water.
  3. Do not induce vomiting.
  4. Offer water or milk to drink if swallowing is not impaired.
  5. Wash skin with soap and water if sap contact occurred.
  6. Flush eyes with clean water for 15 minutes if sap entered the eyes.
  7. Call poison control at 1-800-222-1222 (US) or your vet if swelling is significant, breathing is affected, or symptoms do not improve.

Throat swelling that affects breathing is a medical emergency. Call 911 if someone is having difficulty breathing after ingesting dieffenbachia.

Safe Handling

Dieffenbachia is popular as an indoor plant for its large, patterned leaves and tolerance of low light. The main risk for adults is sap contact during pruning or repotting.

  • Wear gloves when trimming, repotting, or taking cuttings.
  • Wash hands thoroughly with soap and water after handling.
  • Wear eye protection when cutting stems; sap can splash.
  • Keep the plant on a high shelf or in a room that pets and young children cannot access.

Frequently Asked Questions

Why is it called dumb cane? The name refers to the temporary loss of speech that can follow from chewing the stem. Swelling and burning of the tongue and throat can make speaking very difficult. The effect is temporary and resolves as irritation subsides.

Will my cat die from eating dieffenbachia? Fatalities from dieffenbachia in cats are extremely rare. The intense oral pain usually stops ingestion quickly. Most cats recover without treatment. Contact your vet for guidance, especially if your cat swallowed a significant amount.

Is the sap dangerous on skin? It is irritating. Contact causes redness, itching, and burning on skin. Sap in the eyes can cause significant pain and should be flushed immediately with clean water for at least 15 minutes. Wear gloves when handling the plant.

Can I keep dieffenbachia in my home with pets? Yes, if you can keep it completely out of reach. High shelves beyond jumping range and rooms with closed doors are effective. For households with cats that access all surfaces, swapping for a non-toxic plant is worth considering.