“Heaven is high and the emperor is far away,” is a saying according to which we can guess what degree of isolation different areas in China had been experiencing for many generations, using many different methods and standards.
The nowadays generally accepted classification of tea into six types – green, yellow, white, oolong, black and dark is determined by the method of tea leaf processing, namely by the degree of enzymatic oxidation (with the exception of dark tea, which is fermented). The difference between different tea types is therefore primarily in its processing method, not in tea trees as such. On the other hand, not every tea tree is suitable for processing all types of tea. There are many other factors such as the area of cultivation and genetic properties of the tea tree (or the so-called cultivar). According to the statistics, there are more than 400 kinds of cultivars with over 1000 kinds of teas (such as the Dragon Well, Da Hongpao etc.).