Is String of Turtles toxic to cats?

No — string of turtles is listed by the ASPCA as non-toxic to cats. It is a sensible choice for a home with a cat; a curious nibble will not poison them, though no plant is meant to be eaten. The ASPCA individually lists this species (as "Trailing Peperomia", Peperomia prostata, family Piperaceae) as non-toxic to both cats and dogs, with no toxic principle or clinical signs noted. As with any houseplant, large amounts of nibbled foliage may cause mild, transient stomach upset simply from the bulk of plant material, but the plant itself carries no recognised toxin.

Yes — the ASPCA lists string of turtles as non-toxic to cats and dogs. A cat that chews a large amount of any foliage can still get a mild, brief stomach upset, so discourage grazing, but it will not be poisoned.

The ASPCA classification Growli uses applies to both cats and dogs: String of Turtles is non-toxic to dogs as well. See the full string of turtles pet-safety guide for both species.

Reliable ASPCA non-toxic picks for a cat home include spider plant, calathea, parlor palm, peperomia, and most true ferns. Browse the best cats-safe plants list to check more before you buy.