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[9] Found in addition to a 20-hectare (49-acre) isle pile, the Ptrus boutonnire or even buttonhole, Ptrus' authentic vineyard has topsoil and subsoil high in iron-rich clay-based that contrasts coming from neighbouring vineyards, where the soil is actually a mixture of gravel-sand or even clay-sand. Older olds may need to have very little bit of decanting, only sufficient to get rid of the sedimen