Old Plains draws from the Adelaide Plains, a warm corner of Mount Lofty Ranges in South Australia where Shiraz thrives in the continental climate. The winery's portfolio centers on Shiraz in various expressions—from the straightforward Shiraz to the structured Alluvium Old Vine Cabernet-Shiraz blend and the focused Power of One. These wines have been assessed by Wine Spectator, Wine Advocate, Falstaff, Decanter, and Wine Enthusiast. The region's alluvial soils and diurnal temperature swings suit the grape's ripeness and structure, yielding wines with the dark fruit and spice character typical of South Australian Shiraz.