The Oolong tradition comes from Fujian Province on China’s south-east coast, and the province is still a leading producer, although Taiwan has fairly recently developed into an equal competitor. Whereas green tea is produced everywhere in China, Oolong tea is heavily concentrated in the southern parts of the country. Here, the climate is subtropical and humid, so tea growing is located in the cooler mountainous regions. The rough, inaccessible mountains provide special conditions for cultivation, which differ from those further north. Here, the terrain is hilly and robust, and the air is moist. Plants often grow as high as trees, by contrast with the dainty tea bushes in the more northern tea regions of China.