"Are succulents poisonous to cats?" Some are, and the difference is species, not luck. Every succulent below is graded S0 Safe for cats against ASPCA records, with Pet Poison Helpline's pet-safe plants article agreeing on most of them, and none carries a toxic principle on record. This list answers the shelf question — which of the small rosettes and trailers you can keep in a cat household — and membership is checked against the database at build time, so a plant appears here only while its cat record is S0. Six qualify so far. The three succulents cat owners most often already own are not among them, and they are covered further down.
⚠ THE ONE WITH A HEART TOXIN: KALANCHOE
Kalanchoe — the flowering succulent also listed as chandelier plant, devil's backbone, and mother of millions — is S3 Toxic for cats. It contains bufadienolides, which are heart toxins. Most cases stay a stomach upset, with vomiting and diarrhea; the ASPCA lists abnormal heart rhythm (rare), and Pet Poison Helpline warns that if a large enough amount is ingested, changes in heart rate and rhythm, weakness, and collapse are possible. It sits on the same shelf as the succulents above and is not one of them.
Full verdict →Holding an aloe, a jade, or a snake plant right now? Those are the three succulents cat owners most often already have, and none of them is S0. Aloe and jade are S2 Irritant; snake plant is S1 Caution. None is a poisoning on record, but none belongs on the list above, and each verdict page lists the signs to watch.