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
Charleston Tea Plantation buying local products. It helped when the White House discovered the locally grown tea and since 1987, the American Classic Tea brand of the Charleston Tea Plantation has been the official tea of the White House. The Charleston Tea Plantation is located on Wadmalaw Island, outside of Charleston, South Carolina and is open to visitors every day of the week. Admission is free and they offer tours, tea tastings, and other amenities. The factory tour takes visitors inside the factory and covers history, harvesting, and production. The Trolley Tour covers the grounds and the growing of the "Camellia sinensis" plant