Ruan Zhi Oolong Nr.17, Yin Xuan Oolong Nr. 12, 4-Seasons Si Ji Chun Oolong Tee_closeup_collage_webformat Taiwan Oolong-Tee-Kultivare in Nord-Thailand: Ruan Zhi Oolong Nr. 17, Jin Xuan Oolong Nr. 12, 4-Seasons Si Ji Chun Oolong