Decaffeination this trait could be bred into other coffee plants by crossing them with "C. charrieriana", or an equivalent effect could be achieved by knocking out the gene for caffeine synthase in normal coffee plants. Tea may also be decaffeinated, usually by using processes analogous to the direct method or the CO process, as described above. The process of oxidizing tea leaves to create black tea ("red" in Chinese tea culture) or oolong tea leaves from green leaves does not affect the amount of caffeine in the tea, though tea-plant subspecies (i.e., "Camellia sinensis sinensis" vs. "Camellia sinensis assamica") may differ
Korean tea tea to King Gyeongdeok and the Buddha. "Camellia sinensis" tea plants spread throughout the country in 828, when King Heungdeok received seeds from the Tang Empire and sent them to be planted on the Jirisan mountain. Tea was usually offered to the Buddha, as well as to the spirits of deceased ancestors. Tea culture continued to prosper during the Goryeo Dynasty. Tea offering was a part of the biggest national ceremonies, such as Yeondeunghoe and Palgwanhoe, and tea towns were formed around temples. During the reign of King Myeongjong (1131‒1202), Seon-Buddhist manners of ceremony prevailed. Jeong Mongju and other scholars