Is Spanish Marjoram toxic to cats?

No — spanish marjoram 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. Thymus vulgaris (common thyme) is listed as non-toxic to dogs, cats, and horses by the ASPCA. Thymus mastichina belongs to the same genus and shares a similar essential-oil profile; it is not individually listed but no toxic principle specific to this species has been identified. As with all aromatic herbs, very large ingested quantities may cause mild GI upset.

Yes — the ASPCA lists spanish marjoram 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: Spanish Marjoram is non-toxic to dogs as well. See the full spanish marjoram 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.