GRAPE VARIETIES - PORT WINE

Over a hundred varieties of grapes (castas) are sanctioned for Port production, although only five (Tinta Barroca, Tinta Cão, Tinta Roriz (Tempranillo), Touriga Francesa, and Touriga Nacional) are widely cultivated and used. Although Touriga Nacional is the most celebrated Port grape, the difficulty of growing it and its small yields result in Touriga Francesa being the most widely-planted variety within the Douro. White ports are produced the same way as red ports, except that they use white grapes—Esgana-Cão, Folgasão, Malvasia, Rabigato,Verdelho, and Viosinho.