St Mary's Vineyard is established on part of a grazing property that was purchased by the Mulligan family in 1937. The vines are planted on an elevated area of Terra Rossa soil over Limestone. The soils are
generally very stony. Some of the more austere parts of the vineyard are virtually pure rock.
The vines that have survived on these stony areas produce relatively small tonnages compared to local district averages. Varieties planted are Cabernet Sauvignon, Shiraz, Merlot, Cabernet Franc and Pinot.