Castelsina represents a wine culture that is both innovative and respectful of Tuscan tradition. Cantina Cooperativa, founded in 1971, brings together around 250 winegrowers whose vineyards cover an area of approximately 400 hectares in the provinces of Siena and Arezzo. To support its members, the winery adopts a careful vineyard consulting activity. The effort is important but necessary in order to obtain an ever higher quality production while maintaining a strong bond with the territory. The vines cultivated are mainly typical ones, with Sangiovese, Canaiolo, Colorino, Trebbiano Toscano and Malvasia Bianca. These have been joined in recent years by Merlot, Cabernet and Vermentino. In addition to Chianti DOCG and its Riserva, production also includes some interesting Tuscan IGTs.