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Broadly, the number of types of soil suitable for vineyards. While there are hundreds of specific soils in which vines grow, those specific types can generally be divided into three main types: residual soils, alluvial soils, and fluvial soils. Residual soils are formed from degraded bedrock; alluvial soils from water and gravity washing down material from hillsides; and fluvial soils from materials deposited by rivers and flooding.