Castelão is a Portuguese black grape whose style can shift with climate and crop level. Warm, dry sites in the south—especially old sandy vineyards around Palmela—can produce structured wines with tannin, acidity and redcurrant or plum notes. Cooler sites can yield more delicate wines. DNA-based Portuguese records identify its parentage as Cayetana Blanca and Alfrocheiro Preto.
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