Gravelly layers of soil that are often up to ten meters deep and embedded with large quantities of sand, and numerous pebblestones containing iron are factors that shape the terroir of northern Andau. The warmth of the sun is stored in the pebbles and released gradually, contributing to the optimal ripening of the grapes.
In the south of Andau, layers of grey and green clay are found as deep as 1 ½ meters. In the 1920's and 1930's, the substantial local peat deposits were exploited for industrial purposes. The numerous small lakes around Andau indicate a high ground-water level, which is located just below the ground in the southeast.
The ground-water runs four meters deep in the gravelly soil in the north and northeast. It is these areas that are most important for winegrowing. The "Blaue Zweigelt" flourishes on this soil, which instills the wines with intense mineral notes. The soil conditions are comparable with those in Graves in Bordeaux.