By Dial A Vet Veterinary Team
Fresh herbs smell appealing, and curious cats may chew leaves from windowsills or gardens. Several common culinary and “wellness” herbs can irritate the gut, affect the nervous system, or cause more serious toxicosis depending on the plant and amount. When in doubt, treat unknown herb ingestion as a poison question and get triage help. Broader lists: plants that are toxic to cats and dog counterpart herbs toxic to dogs.
Key takeaways
- Onion-family herbs (chives, garlic chives) are especially concerning for cats because of oxidative red-blood-cell injury risk.
- Mint-family plants, oregano, thyme, and similar kitchen herbs often cause drooling, vomiting, or diarrhea when chewed.
- Essential oils and concentrated herbal extracts are higher risk than a nibble of leaf and should stay sealed away.
- Do not induce vomiting or dose activated charcoal unless a veterinarian or poison hotline directs you.
- Call with the plant name (photo helps), approximate amount, and your cat’s weight and signs.
Herbs and plants that commonly raise concern
Risk depends on species, plant part, and dose. This is not a complete list.
- Chives, garlic, onions, leeks: Allium family. Can damage red blood cells; cooked and powdered forms still matter.
- Garlic supplements and “immune” herbal mixes: Often more concentrated than food scraps.
- Oregano, thyme, rosemary, sage, mint, peppermint: Often gastrointestinal upset; essential oils are stronger.
- Lemongrass and some citrus-scented herbs: Irritation and GI signs possible.
- Pennyroyal, comfrey, tea tree (melaleuca) products: Associated with more serious toxicity themes; keep oils and concentrated products away.
- Marijuana / cannabis products: Not a culinary herb in the kitchen sense, but frequently involved in pet exposures; seek care promptly.
Catnip is generally considered lower risk in small recreational amounts for many cats, but overindulgence can still cause stomach upset. Parsley and basil are often better tolerated in tiny amounts than Allium herbs, yet individual cats vary and pesticides on store bunches add risk.
Signs after chewing herbs
- Drooling, lip smacking, pawing at the mouth
- Vomiting or diarrhea
- Lethargy or hiding
- Weakness, pale gums, or rapid breathing (possible Allium-related anemia; urgent)
- Tremors, wobbliness, or unusual behavior after essential oil exposure (urgent)
What to do
- Remove access to the plant or product. Save packaging or a leaf sample.
- Wipe oils from fur if a spill occurred, using mild dish soap if needed, then prevent grooming until clean.
- Do not give milk, oil, salt, peroxide, or human medications unless directed.
- Call your veterinarian, an emergency clinic, or a poison hotline (ASPCA APCC 888-426-4435; Pet Poison Helpline 855-764-7661; fees often apply).
Safer kitchen habits
- Grow cat-safe grasses in a separate pot if your cat likes to graze.
- Keep Allium herbs and garlic powders in closed cabinets.
- Never apply essential oils to cats or to diffusers in poorly ventilated spaces without veterinary guidance.
- Ask before using herbal flea or “calming” remedies marketed online.
FAQ
Is a single chive leaf an emergency?
Amount, cat size, and whether more was eaten matter. Call for triage rather than waiting for anemia signs, which can be delayed.
Are dried herbs safer?
Drying does not make Allium herbs safe. Concentrated seasonings can pack more plant material into a small volume.
Talk with a vet
Herb or oil exposure questions: dialavet.com. Collapse, seizures, labored breathing, or known concentrated oil ingestion needs emergency care now.
References
- ASPCA Animal Poison Control. Toxic and non-toxic plant lists; Allium toxicosis themes.
- Pet Poison Helpline. Essential oil and herbal product guidance.
- Merck Veterinary Manual. Allium toxicosis and plant toxicosis overviews.
Disclaimer: Educational only. Plant and product exposures need identification-specific veterinary advice. This page does not diagnose or prescribe.
