In 1918 the French investigation of tea in some provinces in northern Vietnam have described: Ancient tea trees are distributed mainly in the high northern mountains region of Vietnam, large diameter, high trunk plants up to 2-3 people to hug. The leaves are long and wide, serrated leaf Spire smooth shades, non hairy white snow. Distribution scattered by the streams flowing off the Lot River and Black River 2. The region has many ancient tea is Ha Giang Province and the neighboring province of Lao Cai, Yen Bai, as Lai Chau. In 1924, Dupasquier has conducted the investigation of tea tree forests South Central-Vietnam also have similar conclusions.
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