Plantagenet’s total 126 hectares of vineyard have been carved out of the region’s distinctive Marri soils named after the massive native Marri, or Red Gum trees that grow here. The soils are ironstone gravelly loams over a base of clay, sand or the ironstone rock. The vineyards sites are selected where drainage is good enabling control over vine vigour, one of the most important determinents of fruit quality.

The climate is cool-temperate and strongly influenced by the proximity of the Southern Ocean. Rainfall is plentiful and even during the hottest Australian summer, daytime temperatures are moderated by cooling evening sea breezes. The warm days and cool nights of the Great Southern allow maximum retention acidity and expression of the varietal flavours and aromas required for complex wines.

The combination of soils, landforms and climate - or terroir - creates wines of rare distinction and quality.