The answer lies in an old French concept terroir.
The word itself comes from the French word “terre” which means earth, soil; but the whole concept has a much broader meaning. Terroir stands for all of the “environmental conditions” such as soil, climate, terrain, and biodiversity of a specific region – as well as local winegrowing tradition and culture – which gives wine its unique flavor and aroma.
Soil and weather have the biggest impact on the grapevine growth and therefore on the quality and quantity of grapes.