In Japan, an ornamental version of yuzu called hana yuzu (花柚子, 花ゆず) "flower yuzu" is also grown for its flowers rather than its fruit. A sweet variety of yuzu known as the yuko, only present in Japan, became severely endangered during the 1970s and 1980s; a major attempt has been made to revive this varietal in southern Japan.[6] Another variety of yuzu in Japan, with knobby skin, is called shishi yuzu (獅子柚子, literally "lion yuzu").[7]