The Shiraz vines were planted in 1946 in a single vineyard plot named Rosehill. These low-yielding, old vines have deep and complex root systems. Maurice O'Shea purchased the land during World War II and the site is now regarded as one of the elite vineyards of the Hunter Valley. Once the site of volcanic activity, the Rosehill Vineyard is located at one of the Hunter Valley's highest elevations. This 22-hectare parcel of volcanic loam soil, with patches of limestone and eroded basalt, is fertile and ideal for producing full-flavoured red grapes. O'Shea devoted it to solely planting Shiraz. The vineyard is cultivated using sustainable techniques, such as employing mulch to nourish the vines and growing cover crops to increase the biodiversity in the soil. This sustainable approach has resulted in some of the healthiest vines on the estate in recent years; the vines have developed plentiful canopies which have assisted in preventing sunburn of the fruit. The grapes are hand-harvested.