Is Gardenia Toxic to Cats and Dogs?
Yes, the gardenia plant is toxic to cats and dogs. The American Society for the Prevention of Cruelty to Animals (ASPCA) includes gardenia on its list of plants that are toxic to both species, as well as to horses. While the effects are generally mild, pet owners should prevent their animals from eating this plant.
The plant, also known as Cape Jasmine, belongs to the Rubiaceae family. Its scientific name is Gardenia jasminoides. The toxicity applies to all parts of the plant, so it is important to be cautious if you have gardenias in your home or yard.
Gardenia: what the ASPCA database lists
| ASPCA entry | Gardenia |
|---|---|
| Other common names | Cape Jasmine |
| Scientific name | Gardenia jasminoides |
| Family | Rubiaceae |
| Toxic to | Toxic to Dogs, Toxic to Cats, Toxic to Horses |
| Non-toxic to | None listed |
| Toxic principles | Genioposide, gardenoside |
| Clinical signs listed | Mild vomiting and/or diarrhea, hives. |
What the ASPCA lists for gardenia
The ASPCA has determined that gardenia plants are toxic for dogs, cats, and horses. This conclusion is based on the chemical compounds found within the plant. The specific toxic principles identified are genioposide and gardenoside.
If a pet eats part of a gardenia plant, these compounds can lead to a few specific clinical signs. The ASPCA notes that the effects are typically mild and may include the following:
- Vomiting
- Diarrhea
- Hives
These symptoms are the body’s reaction to the toxic substances in the plant. The appearance of hives, which are raised, itchy welts on the skin, is a notable potential sign of ingestion.
What this means for a pet owner
If you have pets and gardenias, you must ensure your animals do not have access to them. The risk applies whether the plant is grown indoors in a pot or outdoors in a garden. Cats, known for their curiosity, might chew on leaves or flowers. Dogs might dig up roots or simply decide to sample a part of the plant.
Because the entire plant contains the toxic compounds, there is no safe part for a pet to eat. A pet’s size, age, and general health can influence its reaction to a toxic substance. Even if the expected symptoms are mild, ingestion can still cause discomfort and distress for your animal. Supervising pets when they are around any plants is always a sound safety practice.
Keeping cats and dogs and this plant apart
The most effective way to protect your pets is to prevent them from accessing gardenia plants. For indoor plants, place them in rooms that are off limits to your pets. You can also place them on very high shelves or in hanging baskets that are completely out of reach. Be mindful of fallen leaves or flowers, which should be cleaned up promptly before a pet can find them.
For outdoor gardenias, consider using pet safe fencing or other barriers to create a physical separation. Training your dog with commands to avoid certain objects can be helpful, but supervision is the most reliable method of prevention. Never assume a pet will not be interested in a plant, even if they have ignored it in the past.
When to call your vet
If your pet chewed or ate part of this plant, call your veterinarian or an animal poison control line. Note which plant and which part, how much may be gone and when, and take a photo or a piece of the plant with you.
If you suspect your cat or dog has eaten any part of a gardenia plant, contact your veterinarian or the ASPCA Animal Poison Control Center immediately. Be prepared to tell them what your pet ate, how much you think they consumed, and when it happened. Do not attempt to treat your pet at home without professional veterinary guidance.
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.