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 sasanqua or nuts are used to make tea seed oil, which is used for lighting, lubrication, cooking and cosmetic purposes. Tea oil has a higher calorific content than any other edible oil available naturally in Japan. "Camellia sasanqua" is valued in gardens for its handsome glossy green foliage, and fragrant single flowers that can range in color from white to deep pink and are produced extremely early in the season. Various cultivars have been selected, of which 'Crimson King', 'Hugh Evans' and 'Jean May' have gained the Royal Horticultural Society's Award of Garden Merit. Camellia sasanqua Camellia sasanqua, with common name