What role does terroir play in Bordeaux red blend production?

Favorable in the red blend production in Bordeaux is the terroir that determines the specific characters of the wines. Soil composition varies from gravelly and sandy in the Médoc to clay and limestone in the Saint-Émilion, controlling the drainage, water retention, and vine nutrient uptake, which directly affects the grape quality and flavor development. Climate variation such as temperature, rainfall, and also sunlight exposure also affects ripening patterns and grape phenolic development, leading to a great wine structure and aromatic profile. Moreover, vineyard position, altitude, and microclimates are crucial in terroir expression of the area, presenting diversity and also complexity of the Bordeaux red blends.