The gardenia, called chija in Korean, is a plant with beautiful, aromatic white flowers that bears fruit in October. The fruits are a little bitter but have a deep orange color and have been used in Korea as cloth dye and food coloring for a long long time.
As a herbal remedy they are good for fevers, and Koreans often make tea with them. They are also good for arthritis. My grandma used to mix them with flour to create a dough that she would apply to her joints to relieve her arthritis.