Clearspring Organic Japanese Oolong Tea is grown in the luscious hills around Kyoto and Kyushu, areas known for their ideal climatic and soil conditions which produce some of the finest teas in Japan. Oolong is popularly known as Blue Tea (although it is not blue in colour) because it falls halfway between a black tea and a green tea. Whilst Oolong tea is partially oxidized, green tea is not oxidized at all and Black Tea is fully oxidized, which gives it its characteristic dark colour.