Fire Block was excised from a large grazing property in 1923, out of concern that sparks from passing locomotives on the new Clare Valley railway could start bushfires. Situated on the western slope of the Valley, established to vines in 1926, the gnarled old veterans of Fire Block are grown to traditional dryland viticulture, with no systemic sprays or chemical fertilizers. From one of the most parched sites in Valley Clare, the vines sprout bunches of tiny shrivelled berries, yielding small volumes of intensely flavoured juices, to be vinified by the eminent O'Leary Walker winemaking team.