Is White Cedar Poisonous? – Toxicity to Dogs, Cats & Humans

White cedar is poisonous to dogs, cats, and horses. The most common species people encounter, Melia azedarach (chinaberry), produces berries that are toxic to pets and can cause serious symptoms from as few as 6 to 8 berries. The foliage, flowers, and bark also contain the toxins. For humans, the berries cause mild to moderate stomach upset in adults; children are at higher risk.

Before anything else: if your pet has eaten white cedar, call your vet or the ASPCA Poison Control line at 888-426-4435 right now. Bring a photo or sample of the plant if you can.

What Is White Cedar? Identify the Right Plant First

“White cedar” refers to more than one plant species, and they are not equally dangerous. This matters because most toxicity information online conflates them.

The two plants most commonly called “white cedar” are:

Melia azedarach (Chinaberry, Pride of India, Bead Tree, Persian Lilac, Texas Umbrella Tree) is the species most frequently involved in poisoning cases. It is the plant this article focuses on. It grows across the southern United States, Australia, and many other warm regions. Clusters of pale purple flowers appear in spring, followed by hard, yellow berries that persist through winter.

Thuja occidentalis (Northern White Cedar, Eastern Arborvitae) is an ornamental evergreen widely planted as a hedge. It contains thujone, a compound that is toxic in large doses. It is less commonly implicated in poisoning cases than Melia, but skin contact with the foliage can cause irritation.

The naming overlap causes real confusion. If you are trying to identify the tree in your yard, check the fruit: round yellow berries point to Melia. Flat, scaled foliage points to Thuja. This article focuses on Melia, the higher-risk species.

Is White Cedar Poisonous?

Yes. Melia azedarach is toxic to dogs, cats, and horses.

The berries are the most toxic part, but the leaves, flowers, and bark all contain the problematic compounds. A dog that eats 6 to 8 berries can show serious symptoms. Smaller amounts cause stomach upset. No part of this tree should be considered safe for pets.

For adult humans, eating a few berries typically causes nausea, vomiting, and diarrhea. Symptoms are usually self-limiting but unpleasant. For small children, even a small number of berries can cause more pronounced vomiting and diarrhea, and medical attention may be warranted.

Thuja is less acutely toxic by ingestion but can cause skin irritation on contact and should not be considered harmless.

Toxic Principles: What Makes It Poisonous

Melia azedarach contains tetranortriterpenes, a class of compounds also called meliatoxins or toosendanin. These compounds disrupt cellular function in the digestive system and, in larger exposures, affect the nervous system. The concentration is highest in the ripe berries.

Thuja contains thujone, the same compound found in wormwood. Thujone affects the nervous system at high doses. Thuja is also a known skin irritant.

Symptoms of White Cedar Poisoning in Pets

Signs typically appear within a few hours of ingestion. Watch for:

• Drooling or excessive salivation
• Vomiting
• Diarrhea
• Depression or lethargy
• Loss of appetite
• Abdominal pain
• In severe cases: weakness, disorientation, tremors, or seizures

The severity depends on how much your pet ate and the size of the animal. A small dog that eats a handful of berries is at greater risk than a large dog that eats one. Regardless of amount, contact your vet after any known or suspected ingestion.

What to Do If Your Pet Ingests White Cedar

1. Stay calm. Your pet needs you clear-headed.
2. Remove any remaining plant material from your pet’s mouth.
3. Call your veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435. Have the plant name, approximate amount eaten, your pet’s weight, and any symptoms ready.
4. Follow their instructions. Do not induce vomiting unless a professional explicitly tells you to.
5. Bring a photo or sample of the plant to the vet if possible.

Do not wait for symptoms to appear before calling. Time matters with plant toxicity.

Is White Cedar Dangerous to Humans?

Yes, but the risk level is lower for adults than for pets.

Adults who eat the berries typically experience nausea, stomach cramps, vomiting, and diarrhea. These symptoms usually resolve on their own within a day or two. Severe poisoning in adults is rare.

Children are more vulnerable. A small child’s smaller body weight means even a modest number of berries can cause significant vomiting and diarrhea. Dehydration is the main concern. If a child eats any part of a white cedar plant, call poison control or your pediatrician.

People handling the plant regularly should wear gloves. Skin irritation from contact with the foliage is possible, particularly with Thuja.

Safe Handling and What to Do If You Have This Tree

If you have a Melia azedarach on your property:

• Wear gloves whenever you prune or handle the plant.
• Rake up and dispose of fallen berries promptly. Do not compost them and do not chip them into mulch.
• Do not burn the wood. The toxins are not destroyed by fire and can become airborne.
• Keep pets and children away from the tree, especially during berry season.
• If your dog roams freely, consider whether the tree’s location puts them at repeated risk. Removal may be the right call.

For Thuja hedges, wear long sleeves and gloves when trimming. Wash your hands thoroughly after contact.

Frequently Asked Questions

Is white cedar the same as chinaberry? Yes. Melia azedarach is called white cedar in many regions and chinaberry, bead tree, and pride of India everywhere else. They are the same plant.

Are the flowers toxic? The flowers of Melia azedarach contain the same toxins as the rest of the plant, though in lower concentrations. Do not let pets or children eat the flowers.

Can I burn white cedar wood? No. Burning does not destroy the toxins. They can become airborne in smoke, which is a concern for anyone breathing the air nearby.

Is white cedar essential oil safe? Products marketed as “white cedar” or “cedarwood” essential oils vary widely in their source plant and quality. Some are derived from Thuja species, which contain thujone. These oils can be toxic if ingested or improperly diluted. Do not use them around pets. If you use cedarwood oil in your home, keep it out of reach of children and pets and use adequate ventilation.