Although the Brunnenhäuschen site, east of Morstein, faces south, it ripens very late. This is due to the high location and exposure to the west wind, which keeps the temperature cool despite the intense sunlight. Clay marl with limestone and limestone rocks define the precise, dense character of the wine. In addition, there are partial parts of Terra Rossa, i.e. red soils with a high iron oxide content, which give the Rieslings a creamy minerality.