Along with its Montalcino vineyards, Castiglion del Bosco owns a 10 hectares estate called Prima Pietra in Riparbella, close to the Bolgheri wine area on the Tuscan coast. The vines face the Tyrrhenian sea at some 450 metres' elevation, in an almost pristine natural environment. The vines face the Tyrrhenian sea, in an almost pristine natural environment; the site enjoys abundant sun and ventilation, and the iron-rich, rocky soils ensure wines of superb structure. There, after in-depth soil and climate research, the technical team, planted merlot, cabernet franc, cabernet sauvignon, and petit verdot, at a density of 9,600 vines per hectare. These Bordeaux varieties flourish in this terroir, producing wonderfully expressive fruit.