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
Camellia japonica a long time. One of the most important plants related to "Camellia japonica" is the "Camellia sinensis", which is the plant tea comes from. This plant is not usually grown in gardens because it has small white flowers, unlike the "Camellia japonica", which has larger, more beautiful flowers. It is not seen in art as often as the "Camellia japonica", but it is shown in a painting called the "Song Hundred Flowers" which hangs in the Palace Museum in Beijing. "Camellia sinensis" may have been used as medicine during the Shang Dynasty. It was first used for drinking during the