GSM is Rosemount Estate’s interpretation of the traditional old-world blend of Grenache, Shiraz and Mourvèdre, sourced from McLaren Vale. The rich, spicy fruit flavors of old-bush-vine Grenache balances the opulent power of Shiraz and the firm structure of Mourvèdre. With the Shiraz providing great structure and balance to the upfront fruit of the Grenache, our GSM is not only highly attractive in its youth, but also has the proven ability to age well, up to 10 years with careful cellaring.