Why is Cabernet Sauvignon often blended with small amounts of Merlot or Malbec?

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Blending Cabernet Sauvignon with small amounts of Merlot or Malbec targets the wine’s texture and balance. Cabernet Sauvignon brings strong tannins, higher acidity, and a firm, structure-heavy backbone that can feel austere on its own. Merlot or Malbec add softer tannins, riper fruit, and padding in the mid-palate, which rounds out the mouthfeel and makes the wine more approachable while preserving Cabernet’s depth and aging potential. Malbec can also contribute deeper color and fruit character, while Merlot tends to bring plushness. The overall effect is a more harmonious, balanced wine with a smoother mid-palate. So the reason blends are used is to soften tannins and add mid-palate flesh, not primarily to increase acidity, reduce alcohol, or only to boost color.