Arganza produces Mencía-based wines from Bierzo, a region in Castilla y León known for its mineral soils and cool-climate viticulture. The winery's portfolio centers on this indigenous Spanish variety, which thrives in Bierzo's distinctive terroir. The Bierzo Mencía Premium Castillo Colina and Premium Lagar de Robla represent the winery's core expression of the grape, while Flavium Selección Bierzo offers another interpretation of the region's signature varietal. Mencía in Bierzo typically displays dark fruit character with structured tannins and acidity shaped by the region's elevation and Atlantic influences. These wines have been assessed by Wine Enthusiast, Wine Spectator, Wine Advocate, and Decanter.