Is Lemon Balm Toxic to Cats and Dogs?
Lemon balm is considered nontoxic for both cats and dogs. The American Society for the Prevention of Cruelty to Animals (ASPCA) includes Melissa officinalis on its list of plants that are safe for these pets.
While this is reassuring for pet owners, the term nontoxic does not mean the plant is intended to be a food source. Even safe plants can cause digestive issues if a pet eats too much of them. It is always best to prevent pets from grazing on houseplants or garden foliage.
Lemon Balm: what the ASPCA database lists
| ASPCA entry | Lemon Balm |
|---|---|
| Other common names | Balm, Common Balm, Balm mint |
| Scientific name | Melissa officinalis |
| Family | Lamiaceae |
| Toxic to | None listed |
| Non-toxic to | Non-Toxic to Dogs, Non-Toxic to Cats, Non-Toxic to Horses |
| Toxic principles | None listed |
| Clinical signs listed | None listed |
What the ASPCA database says about lemon balm
The ASPCA plant database is a primary resource for pet toxicity information. It officially lists lemon balm, also known as common balm or balm mint, as nontoxic to cats, dogs, and horses. The scientific name for this plant is Melissa officinalis, and it belongs to the Lamiaceae family.
Consistent with its nontoxic classification, the ASPCA does not list any toxic principles or specific clinical signs of poisoning associated with a pet ingesting this plant. This lack of listed toxins provides confidence that a small taste is unlikely to cause a toxic reaction.
What a nontoxic plant means in a home with pets
Having a nontoxic plant like lemon balm in your home or garden means that accidental ingestion is not an emergency poisoning event. If your dog or cat chews on a leaf, it is not a cause for panic. This makes it a safer choice for households with curious pets compared to plants known to be poisonous.
However, the designation is about toxicity, not digestibility. Lemon balm is not part of a cat’s or dog’s natural diet. Their digestive systems are not designed to process large amounts of plant matter. Therefore, while the plant itself does not contain recognized poisons for pets, eating it can still lead to problems.
Points to consider with any nontoxic plant
Even with safe plants, it is wise to follow general pet safety guidelines. Supervising pets around any plant, whether indoors or outdoors, is always recommended. Preventing them from eating large quantities of leaves, stems, or flowers can help avoid potential issues.
- Digestive upset: Consuming a significant amount of any plant material can lead to gastrointestinal irritation. Symptoms may include vomiting, diarrhea, or a decreased appetite.
- Individual sensitivities: Just like people, some pets can be more sensitive than others. A food or plant that is fine for most pets might cause a mild reaction in a specific animal. When introducing new items, it is best to proceed with caution.
- Choking hazard: Large pieces of leaves or tough stems could potentially pose a choking risk, especially for smaller animals or pets that eat quickly without chewing properly.
Reading ingredient labels is also important for any products containing plant extracts. Ensure they are specifically formulated for pets and do not contain other ingredients that could be harmful.
When to call your vet
A non-toxic listing means the plant is not expected to poison pets, not that eating it is harmless. Call your vet if your pet shows any of the signs below after chewing on a plant.
If your pet has eaten a large amount of lemon balm or any plant and is showing signs of distress such as vomiting, diarrhea, or lethargy, contact your veterinarian or the ASPCA Animal Poison Control Center. It is helpful to tell them what your pet ate, how much, and when it happened. Always have the plant’s packaging or name available if possible.
Emergency signs: go now
- Collapse, fainting or severe weakness
- Seizures, tremors or trouble standing
- Trouble breathing or blue, gray or very pale gums
- Repeated vomiting or retching, or a swollen, painful belly
- Any known contact with a substance listed as toxic, even before signs appear
Book an appointment soon
- Vomiting or diarrhea that lasts or keeps coming back
- Not eating or drinking, or drinking much more than usual
- Drooling, pawing at the mouth or a swollen face
- Lethargy, hiding or acting unlike themselves
ASPCA Animal Poison Control Center: (888) 426-4435 (a consultation fee may apply). Your own vet or nearest emergency clinic is always a good first call.
Sources
Last checked October 21, 2026. Listings and guidance can change; your veterinarian knows your pet’s health history.