Is Ageratum houstonianum 'Blue Horizon' toxic to dogs?

Yes — ageratum houstonianum 'blue horizon' is toxic to dogs according to the ASPCA. Keep it well away from any dog that chews plants; reactions can be significant. Ageratum houstonianum is not on the ASPCA list, but it contains pyrrolizidine-type alkaloids and coumarin compounds and is generally regarded as toxic if ingested. Treat it as toxic to pets and people; ingestion can cause digestive upset and, with chronic exposure, potential liver harm. Verify with a vet if ingestion is suspected.

Ageratum houstonianum is not on the ASPCA list, but it contains pyrrolizidine-type alkaloids and coumarin compounds and is generally regarded as toxic if ingested. Treat it as toxic to pets and people; ingestion can cause digestive upset and, with chronic exposure, potential liver harm. Verify with a vet if ingestion is suspected. Signs usually appear soon after chewing rather than hours later — watch for drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy after your dog has had access to ageratum houstonianum 'blue horizon'.

Stay calm. Remove any plant from your dog's mouth and take the plant away. Note how much was eaten and when, and do not induce vomiting unless told to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice; a leaf or photo helps the vet treat it correctly.

The ASPCA classification Growli uses applies to both cats and dogs: Ageratum houstonianum 'Blue Horizon' is toxic to cats as well. See the full ageratum houstonianum 'blue horizon' pet-safety guide for both species.

For a similar look without the risk, see the best dogs-safe plants list — every plant there is ASPCA non-toxic to cats and dogs.