Maria and Sepp Muster took over his parents 10 hectare winery in Styria in 2000 and began to work the vines biodynamically. They had an easy transition, as no herbicides or pesticides had ever been used there before. Rocky clay and silt soils dominate the steep hills of their vineyards. This clay silt is known locally as “Opok” after which two of their wines are named. The Graf wines also feature the opok soil but have steeper south facing slopes that reduce yields and produce wines of more structure and pronounced mineral character. And finally, they make orange wines like Erde, which are in special clay bottles.