Yes, yarrow is toxic to cats. The ASPCA lists yarrow (Achillea millefolium) as a plant that is harmful to felines, with multiple compounds in the plant capable of causing gastrointestinal and other symptoms if ingested. While yarrow poisoning is rarely fatal, even a small amount can make a cat noticeably sick.
What Makes Yarrow Harmful to Cats
Yarrow contains three categories of toxic compounds that affect cats. The first is a group of glycoalkaloids, most notably one called achillein. The second is monoterpenes, which are volatile organic compounds found throughout the plant. The third is a type of compound called sesquiterpene lactones, including one specific to yarrow called achillin. Together, these substances irritate the lining of the digestive tract and can cause broader symptoms if enough plant material is consumed.
Every part of the yarrow plant contains these compounds, from the flowers and stems to the feathery leaves. Dried yarrow, such as that found in decorative arrangements or herbal products, still poses a risk. Essential oils derived from yarrow are also dangerous and are actually more concentrated than the fresh plant.
How to Identify Yarrow
Yarrow is extremely common across North America, growing wild in fields, along roadsides, and in many home gardens. It’s a perennial that comes back year after year, so knowing what it looks like is useful if your cat spends time outdoors or you’re planning a garden.
The plant has flat-topped or dome-shaped clusters of small white flowers (though cultivated varieties can be pink, red, or yellow). Its leaves are fine, feathery, and fern-like, with an aromatic scent when crushed. Yarrow typically grows one to three feet tall and blooms from late spring through early fall. Because it’s drought-tolerant and low-maintenance, it’s a popular choice in pollinator gardens and wildflower mixes, which means it may already be in your yard without you having planted it intentionally.
Symptoms of Yarrow Poisoning
If a cat chews on or eats yarrow, the most common signs involve the digestive system. You may notice vomiting, diarrhea, drooling, or a loss of appetite. Some cats also develop skin irritation around the mouth or face from contact with the plant’s oils and lactones.
In larger exposures, symptoms can extend beyond the gut. Cats may become lethargic, uncoordinated, or show signs of abdominal pain such as crouching in an unusual posture or resisting being picked up. The severity depends on how much was eaten relative to the cat’s body weight. A single nibble on a leaf is less concerning than a cat that has chewed through several stems, but any amount warrants attention since cats are small animals with limited ability to metabolize plant toxins.
What to Expect at the Vet
If you suspect your cat has eaten yarrow, bringing them to a veterinarian promptly gives you the most options. Treatment generally follows three principles: preventing further absorption of the toxins, providing supportive care, and managing symptoms as they appear.
Inducing vomiting is one of the first steps a vet may consider, but it’s more complicated in cats than in dogs. Common emetics used for dogs, like hydrogen peroxide, are not safe for cats. Veterinary-specific medications can be used instead, though their success rate in cats hovers around 50%. This is why timing matters. If the plant material hasn’t been in the stomach long, there’s a better chance of removing it before more toxins are absorbed.
Beyond that, your vet may administer activated charcoal to bind remaining toxins in the gut, along with IV fluids to prevent dehydration from vomiting or diarrhea. Most of the remaining treatment is supportive: anti-nausea medication, fluid replacement, and monitoring until the cat’s body clears the compounds on its own. There is no specific antidote for yarrow poisoning, but the good news is that most cats recover fully with appropriate care. Serious complications are uncommon as long as the exposure is identified and treated reasonably quickly.
Keeping Cats Safe Around Yarrow
If yarrow is growing in your garden and you have cats that go outdoors, removing the plant is the simplest solution. Yarrow spreads through both seeds and underground runners, so pulling it up by the roots is more effective than just cutting it back. For indoor cats, check dried flower arrangements, herbal sachets, and any loose herbal tea blends that might contain yarrow, as curious cats can get into these easily.
If you’re not sure whether a plant in your yard is yarrow, the fern-like leaves and flat clusters of tiny flowers are the key identifiers. When in doubt, you can photograph the plant and use a plant identification app or check the ASPCA’s searchable database of toxic and non-toxic plants.
Cat-Safe Alternatives for Your Garden
If you love yarrow for its drought tolerance, pollinator appeal, or low maintenance, several non-toxic plants fill a similar role in the garden. Tickseed (Coreopsis) is a cheerful yellow wildflower that thrives in full sun and handles poor soil and dry conditions well. Cosmos produce delicate, daisy-like blooms on tall stems and are one of the easiest flowers to grow from seed.
For late-season color, asters bloom in purple, blue, or pink through fall and provide nectar for migrating butterflies. Goldenrod produces bright yellow plumes in late summer and supports a wide range of pollinators. Bee balm rounds out the list with vibrant red, pink, or purple flowers that attract hummingbirds and butterflies. All five of these are non-toxic to cats and grow well across most of the U.S., making them practical swaps for yarrow in a pet-friendly garden.