Pet safety
Is Sweet Flagtoxic to cats & dogs?
Acorus calamus
Quick verdict — at a glance
- Toxic to cats?
- Yes — toxic
- Toxic to dogs?
- Yes — toxic
- ASPCA classification
- Toxic to pets · botanical name Acorus calamus
Is sweet flag safe for cats and dogs?
Avoid for a pet household. Sweet Flag is ASPCA-listed toxic to both cats and dogs; even a small chew can drive a vet visit. Plenty of look-alikes on the non-toxic side of the list — see alternatives below. This classification follows the ASPCA Toxic and Non-Toxic Plant List, the most widely used reference for companion-animal plant safety in the US and the standard most UK vets cite as well. Acorus calamus is toxic to pets. The foliage and rhizome contain β-asarone (and related alkenylbenzenes), which is potentially carcinogenic and can cause vomiting and, in dogs, seizures on ingestion. While Acorus is not on the named ASPCA list, multiple toxicology sources document its toxic principle, so it should be kept away from cats, dogs and children; contact a vet if any part is eaten.
| Pet | Toxic? | Per ASPCA |
|---|---|---|
| Cats | Yes | Toxic to pets |
| Dogs | Yes | Toxic to pets |
What happens if a pet eats sweet flag?
Acorus calamus is toxic to pets. The foliage and rhizome contain β-asarone (and related alkenylbenzenes), which is potentially carcinogenic and can cause vomiting and, in dogs, seizures on ingestion. While Acorus is not on the named ASPCA list, multiple toxicology sources document its toxic principle, so it should be kept away from cats, dogs and children; contact a vet if any part is eaten. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to sweet flag, treat it as a suspected ingestion and act on the steps below.
What to do if your pet ate sweet flag
- Remove any plant material from your pet's mouth and move sweet flag out of reach.
- Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
- Do not induce vomiting unless a vet or poison-control specialist instructs you to.
- Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
- Bring a leaf or photo of sweet flag to the appointment so it can be treated correctly.
This page is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide rather than the plant. If you are worried, always contact a vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.
Pet-safe alternatives to sweet flag
Want the same look without the risk? These plants are listed as non-toxic to cats and dogs by the ASPCA and have similar care needs:
- Basil — non-toxic to cats and dogs (care guide)
- Herb garden — non-toxic to cats and dogs (care guide)
- Rosemary — non-toxic to cats and dogs (care guide)
- Thyme — non-toxic to cats and dogs (care guide)
Sweet Flag and pets — frequently asked questions
Is sweet flag toxic to cats?
Sweet Flag (Acorus calamus) is toxic to cats according to the ASPCA. Acorus calamus is toxic to pets. The foliage and rhizome contain β-asarone (and related alkenylbenzenes), which is potentially carcinogenic and can cause vomiting and, in dogs, seizures on ingestion. While Acorus is not on the named ASPCA list, multiple toxicology sources document its toxic principle, so it should be kept away from cats, dogs and children; contact a vet if any part is eaten. Keep it out of reach and contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if your cat chews it.
Is sweet flag toxic to dogs?
Per the ASPCA, Sweet Flag (Acorus calamus) is toxic to dogs. Dogs often chew more enthusiastically than cats, so a toxic plant like sweet flag is best removed from the floor and low shelves entirely.
What happens if my pet eats sweet flag?
Acorus calamus is toxic to pets. The foliage and rhizome contain β-asarone (and related alkenylbenzenes), which is potentially carcinogenic and can cause vomiting and, in dogs, seizures on ingestion. While Acorus is not on the named ASPCA list, multiple toxicology sources document its toxic principle, so it should be kept away from cats, dogs and children; contact a vet if any part is eaten. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to sweet flag, treat it as a suspected ingestion and act on the steps below.
What should I do if my cat or dog ate sweet flag?
Stay calm. Remove any remaining plant material from your pet's mouth and take the plant away so they cannot eat more. Note roughly how much was eaten and when. Do not make your pet vomit unless a vet or poison-control specialist tells you to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice. Bringing a photo or a leaf of sweet flag to the appointment helps the vet treat it correctly.
What are pet-safe alternatives to sweet flag?
If you want a similar look without the risk, good non-toxic swaps include basil, herb garden, rosemary, thyme. All of these are listed as non-toxic to cats and dogs by the ASPCA, so they suit a home where pets have access to your plants.
Full sweet flag care
Pet-safety is one piece of the picture. For light, watering, soil, and troubleshooting, see the complete sweet flag care guide, or browse the full pet-safe plant library to check another plant before you buy it.