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Thesis
Chapter One speaks of tea trees in the Bashan gorges so thick that two men could barely encircle them; people cut the boughs to reach the leaves. Two facts follow: large arborescent tea trees existed in the south-west, and picking required cutting because the canopy was too high.
Wild and cultivated ancient tea trees still survive in Yunnan, Guizhou and Sichuan, and their girth and height can be compared with the text. But “ancient tree” is not a synonym for “good tea”: age is one variable among cultivar, ecology, picking and processing.
Lu Yu’s observation also has limits. He writes about the Bashan gorges, not every tea region; his sample is local. The passage is more useful as a species map than as a myth of origin.
Source: 百度百科·茶经