It is all in the soil. And the climate. And not to forget the elevation. When we visited the vineyards in Mendoza, Argentina we were surprised to find similar growing conditions. Sandy loam soil with rocks embedded and a dry, arid climate requiring irrigation during the entire growing season. Argentina, especially in the Uco valley can boast more rocks, through the rocks are fewer in Colorado they are bigger. Both areas depend on the run off from the snow pack in the mountains, which feeds into the Colorado river and flows right through Palisade. In Mendoza the consensus is that grapes grown in higher elevations make better wine. The highest locations in the Uco valley, 45 minutes South of Mendoza are at 4900 feet. The BookCliff Vineyards in Palisade are at 4600 feet. As a result Colorado wines taste more like the wines in Mendoza than in California and the same grape varieties are used to make world class wine - Malbec, Cabernet Franc, Petit Verdot.