Indian tea culture thriving in Assam, when a native from the province present, seeing some tea said, 'We have the plant growing wild in our jungles.'" It is then documented that the Assamese nobleman, Maniram Dutta Barua, (also known as Maniram Dewan) showed British surveyors existing fields used for tea cultivation and wild tea plants growing in the Assamese jungle. In the early 1820s, the British East India Company began large-scale production of tea in Assam, India, of a tea variety traditionally brewed by the Singpho tribe. In 1826, the British East India Company took over the region from the Ahom kings through
Sayama tea of tea was interrupted by war during the Sengoku period. Widespread tea growing restarted in the Mid-Edo period. In 1802, a technique called , first steaming and then roasting on the surface of washi was invented by , , and , based on the Uji roasting technique, which was deemed the best method in Japan at that time. This led to the revival of tea production in the region. In 1819 (Bunsei 2), tea leaves produced in this method started to be shipped to Edo in large amounts, receiving good reputations. After the Meiji Restoration, tea became one of the