Is Wild Rosemary Poisonous? – Humans, Dogs, and Cats

Wild rosemary (Andromeda polifolia) is poisonous. All parts of the plant contain andromedotoxin, a grayanotoxin that disrupts sodium channels in muscle tissue. The plant is toxic to humans, dogs, cats, horses, and other animals. If you found a plant that looks like rosemary and you are wondering whether it is safe, the answer depends entirely on which plant you are looking at, and the two most commonly confused plants are nothing alike.

Wild Rosemary vs. Rosemary - Are They the Same?

No. These are two completely unrelated plants that share a misleading name.

Common culinary rosemary is Rosmarinus officinalis, a member of the Lamiaceae (mint) family. It is non-toxic to dogs, cats, horses, and humans. The ASPCA lists it as safe for pets. You can cook with it, grow it in your garden, and your dog can safely sniff around it.

Wild rosemary, also called bog rosemary or marsh andromeda, is Andromeda polifolia, a member of the Ericaceae (blueberry and heath) family. It is poisonous. The shared name comes from a similarity in leaf shape, nothing more.

Here is how to tell them apart:

Andromeda polifolia has blue-green leaves with rolled-under margins. Its flowers are pink or white and shaped like small bells. The plant grows low, usually under 50 cm, and is found in bogs, peatlands, and wet acidic soils across northern latitudes. If you are in a swampy area, you are likely looking at this plant.

Common rosemary has narrow, needle-like leaves that do not roll under. Its stems are woody, and its purple flowers grow in clusters. It thrives in well-drained garden soil and Mediterranean climates. It does not grow in bogs.

If you are holding a plant from a garden bed in a temperate region, you probably have common rosemary. If you are knee-deep in a peat bog in Scandinavia or northern North America, you are looking at Andromeda polifolia.

What Makes Wild Rosemary Toxic?

Andromedotoxin, also called grayanotoxin, is the culprit. The same toxin family appears in rhododendrons and some pieris species. The mechanism is straightforward: andromedotoxin disrupts voltage-gated sodium channels in cardiac and skeletal muscle. This interferes with normal muscle function, affecting the heart most dangerously.

The toxin is present throughout the plant but concentrates in flowers, young leaves, and stems. It does not disappear when the plant dries. Hot water extraction - such as making tea - releases the toxin into the liquid, which makes infusions from this plant just as dangerous as eating it fresh.

Which Parts of Wild Rosemary Are Poisonous?

All parts. Leaves, stems, flowers, bark, roots, and seeds all contain andromedotoxin. Even the nectar is toxic. This matters for beekeepers in affected regions: honey made from Andromeda polifolia nectar can carry the toxin.

Symptoms of Wild Rosemary Poisoning

Humans

Symptoms typically appear within a few hours of ingestion and include watering of the mouth and eyes, nausea, vomiting, diarrhea, weakness, a slow pulse, and low blood pressure. Loss of coordination, convulsions, and progressive paralysis are possible in severe cases. These severe reactions come from NC State Extension’s documentation of the plant’s effects.

Dogs and Cats

Pets are at significant risk. Signs of poisoning include excessive drooling, depression, weakness, vomiting, diarrhea, heart arrhythmias, and hypotension. Death is possible in severe cases, particularly if a small dog or cat consumes a large amount. The Pet Poison Helpline documents these symptoms for Andromeda japonica, a related species with the same toxin.

Horses and Livestock

Grazing animals in boggy pastures face the greatest risk. Symptoms mirror those in humans and pets: gastrointestinal distress and cardiac involvement. Horses are particularly susceptible to toxic plants they encounter in unfamiliar grazing areas.

Children

Children experience the same symptoms as adults. Their smaller body weight means a lower dose can produce serious effects. Any suspected ingestion in a child warrants an immediate call to poison control.

What to Do If Wild Rosemary Is Ingested

1. Do not induce vomiting unless a vet or poison control operator specifically directs you to do so.
2. Call US Poison Control for humans: 1-800-222-1222, available 24 hours a day, every day.
3. Call ASPCA Animal Poison Control for pets: 888-426-4435, or the Pet Poison Helpline: 855-764-7661.
4. Go to the nearest emergency vet for pets, or the nearest emergency room for humans.
5. Bring a photo or plant sample if possible to help identification.

Speed matters. The sooner treatment begins, the better the outcome. Recovery is likely with prompt attention. Death from casual exposure is uncommon, but the risk is real, particularly for small pets and children.

Wild Rosemary in the Garden

Andromeda polifolia is occasionally sold as an ornamental for rain gardens, bog gardens, and pond edges. Cultivars such as Blue Ice and Nana are available from specialty nurseries. The plant prefers acidic, consistently moist soil and cool climates, generally USDA Zones 2 through 6.

If you grow it, follow these precautions:

• Keep it out of reach of children and pets.
• Wear gloves when pruning or handling any part of the plant.
• Wash your hands thoroughly after contact.
• Do not compost plant material that has been chewed or damaged.

Touching the plant intact is not a systemic risk. The danger comes from ingestion. Casual handling followed by hand washing is safe.

Frequently Asked Questions

Is wild rosemary the same as rosemary?

No. Common rosemary (Rosmarinus officinalis) is a safe culinary herb in the mint family. Wild rosemary (Andromeda polifolia) is a poisonous plant in the heath family. They are unrelated.

Can wild rosemary kill a dog or cat?

Yes, in sufficient quantity. Small dogs and cats are most at risk. Prompt veterinary care dramatically improves the outcome. Do not wait for symptoms to appear before calling poison control.

What does wild rosemary look like?

It has blue-green leaves with rolled-under edges, grows low to the ground in wet acidic soils, and produces pink or white bell-shaped flowers. It looks nothing like common rosemary once you know what to look for.

I found a plant that smells like rosemary in the wild. Is it safe?

Andromeda polifolia does not smell strongly of rosemary despite the name. True rosemary has a strong, unmistakable scent. If you are uncertain about a plant’s identity, do not eat it and keep pets away.

Is it safe to grow wild rosemary in a garden with pets?

No. The plant is toxic through ingestion, and curious pets may chew on garden specimens. Choose non-toxic ornamentals instead.

Are there safe alternatives for cooking or herbal use?

Yes. Common rosemary (Rosmarinus officinalis) is safe, widely available, and an excellent culinary herb. There is no reason to use wild rosemary in cooking or herbal preparations.