Is Threeleaf Foamflower toxic to cats?

Mildly. The ASPCA lists threeleaf foamflower as mildly toxic to cats — a chewing cat typically gets mouth irritation, drooling, and vomiting rather than a medical emergency, but it is still best kept out of reach. Tiarella is not listed on the ASPCA Toxic and Non-Toxic Plant database (neither toxic nor non-toxic). No significant toxic principles are documented for the genus in peer-reviewed veterinary literature, but because an explicit ASPCA non-toxic listing is absent, the precautionary classification is mildly-toxic. Ingestion of plant material may cause mild gastrointestinal upset.

Tiarella is not listed on the ASPCA Toxic and Non-Toxic Plant database (neither toxic nor non-toxic). No significant toxic principles are documented for the genus in peer-reviewed veterinary literature, but because an explicit ASPCA non-toxic listing is absent, the precautionary classification is mildly-toxic. Ingestion of plant material may cause mild gastrointestinal upset. 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 cat has had access to threeleaf foamflower.

Stay calm. Remove any plant from your cat'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: Threeleaf Foamflower is mildly toxic to dogs as well. See the full threeleaf foamflower pet-safety guide for both species.

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