Sangiovese is Italy's most planted grape. It's at its best in Chianti Classico, Brunello di Montalcino, and Vino Nobile di Montepulciano. It has think skin and can be prone to rot. It can often have a long ripening season, with harvests in Tuscany often not coming until October. This makes a long-lived, high-alchohol wine in hot years, and an overly acidic, high-tannin wine in cold years. Sangiovese is increasingly grown in areas outside Italy due to its popularity.