Uji tea is a common name for all Japanese green tea produced from Uji, Kyoto. The 3 main types of Uji tea are Matcha, Sencha and Gyokuro. Japanese tea is originated from the Tang Dynasty of China, which is during the Heian period of Japan when Chinese influences were at its peak. 

When tea seeds were introduced to Japan, they were first planted at Toganoo. These seeds were later spread in Uji, which became the site to produce the highest quality of tea leaf in Japan. 

The increasing popularity of Uji tea is deeply connected with the successful of tea ceremonies, including Tōcha, Chanoyu and Senchadō.

- Wikipedia