Oolong teas - partially oxidized teas are traditionally produced in south China and Taiwan, but recently also in Japan and South Korea. With over 3,000 types known, they have enjoyed hundreds of years of popularity. They are categorized by the percent of oxidation. In Taiwan, tea has grown since the 19th century. The Portuguese name for the island is Formosa, “Beautiful Island”. The partially oxidized oolong-type teas have become world-renowned. Top oolongs usually come from the January flush; then there is the first flush (end of April − May), second flush (end of May − June), and third flush (August).