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Can some one give a sitation for the button hole soil name? I just asked Nicolas Coporandy at Cheval Blanc about this soil and he said hes never heard this term.
Hey Sandeep! The "buttonière" is a specific geological formation in Pomerol as opposed to the name of the soil. The buttonhole contains thick blue clay. This stretch of thick blue clay extends out of the buttonhole and into the vineyards of Cheval Blanc. The section of the vineyards with blue clay is where the house's oldest Cabernet Franc vines live. All in all, the buttonhole is not the soil type but the formation in Pomerol. Cheval Blanc would be much more familiar with the specific soil type of blue clay as they do not lie in the buttonhole.