Which class did the Tang Dynasty belong to in the history of tea culture development in China? Summarize it with an ancient poem, and list the various manifestations of tea culture in this period.

Lu Yu has a poem saying, "The Emperor never tasted Yangxian tea, but a hundred herbs dare not sprout first."

The Tang Dynasty, specifically after the middle of the Tang Dynasty, was an epoch-making and important era in the development history of China's tea industry and tea culture. History says that "tea flourished in the Tang Dynasty" or "flourished in the Tang Dynasty". In the Tang dynasty, the word "tea" came into being after a stroke of tea. Tea science appeared only when Lu Yu wrote classics; Tea began to be taxed before tea administration was established; The production and trade of bordered tea began only when tea was sold. In a word, until then, tea has really become a remarkable production cause and culture in China's social economy and culture.