Most expert sources suggest sandy loam as the best soil type for growing grapes. This type of soil offers the best blend of characteristics. It drains well but contains a moderate amount of nutritious organic matter and generally lies within the preferred pH range.
Enriching your soil with compost is one of the best things you can do for your garden.
San Pablo Water Washed Sandstone rock is from the rivers of Northern California. San Pablo is used for veneer walls, ponds dry river beds, and accent stones. It is smooth and gray to deep blue in color. They are also in irregular flat shapes.