Gardenias are not poisonous to cats and will not harm them. However, if a cat accidentally ingests gardenias, it may experience food poisoning symptoms such as nausea and vomiting. Cats love leafy greens and like to lick or nibble on them. If you want to keep gardenias at home, place them out of your cat's reach to prevent accidental ingestion and potential harm to their health and safety.

How to deal with a cat that has accidentally eaten gardenia flowers:
1. The owner should first stop feeding the cat, and then give it water to dilute the food.
2. Next, give the cat some medication to induce vomiting, forcing it to vomit out the remaining gardenia petals in its stomach.
3. If the condition does not improve, the patient should be taken to the hospital for treatment.
Many other green plants should not be ingested by cats, such as pothos, begonias, lilies, oleanders, and hydrangeas. Therefore, it's essential to understand the plants you choose before keeping them. Growing a suitable amount of cat grass at home can meet a cat's need for greenery, while also providing vitamins and minerals and promoting intestinal health.