As this confluence of soil constituents are found nowhere else, the Carmody McKnight vineyards are particularly suitable for these innovative technological investigations and agricultural applications. For the first time, the centuries-long quest to understand “terroir” is at hand! The vineyards are the supreme example of sustainability in farming.
In the book Terroir by James E. Wilson, the author describes the legendary soils of France. He describes calcium montmorillonite which in France is called “the wonder soil,” “swelling clays.” Wilson states that calcium montmorillonite is “characterized by its incredible cation-exchange capacity (cations are atoms or molecules with a positive electrical charge and the ability to hold a large amount of plant essential nutrients). This quality is as vital to the life functioning of the vineplant as oxygen is to the human bloodstream. It is how plants get their nutrients and neutralize toxic chemicals.”
Calcium montmorillonite has the unique property of extraordinary moisture retention ~ qualities contributing to supreme balance. Limestone and calcium montmorillonite are the two most important soil constituents in the renowned French vineyards ~ known to contribute to wine greatness, and without them — wine inferiority. Do they exist in California? Almost nowhere. Not in Napa, nor Sonoma. Not in Santa Barbara. Limestone and calcium montmorillonite exist in the Carmody McKnight vineyards — in abundance!
It also has to be noted that in the Carmody McKnight vineyards there is a third component ~ backyard volcanoes, volcanic intrusion, magma, guaranteeing the most mineral abundant wine and the cleanest, purest varietal expression!
This “wonder soil” classifies into the “smectite” mineralogy class by the USDA soil taxonomy. The predominate clay particles are calcium montmorillonite. It is rare to find any similar soil, which is this shallow in relation to the weathered igneous (volcanic) bedrock. This revelation occurred during the most recent Cal Poly, SLO soil mapping project, conducted on Carmody McKnight Estate Vineyards & Winery and led by Thomas J. Rice, Ph.D., C.P.S.S. It ultimately required comparing this unique soil with over 25,000 USDA soil series worldwide and no comparable soil was found!