Castañal grape is an indigenous red variety that can be only be found in O Rosal area, in the Rías Baixas appellation. Bunches are medium size, round shape and black-blue color, and its skin is colorless until the grape reaches the ripening point. In order to limit the production to 7.000 kg/ha, the system to conduct the plant is double rope with a 3 thumbs/arm and 2 bud/thumb short pruning. The plantation density is between 2.000 and 2.500 plants/ha. The soil is acid and it is formed by stones and metamorphic schist’s rocks. The space between vines is made of natural vegetative cover formed by indigenous species like ray-grass and white clover. Harvest takes place around end of September.