Oltradige, which is where Kaltern and most of our vineyards or located, extends parallel to the Mendola ridge in a north-south direction. The area has a geological boundary in the west in the form of a porphyry terrace and the dolomitic rock faces of the Mendola massif while the quartz porphyry rock of the Mitterberg separates it from the Adige Valley in the east.
Quartz porphyry, which is of volcanic origin, is the oldest bedrock and parent material of the subsoils in Oltradige. In the last few millennia it has been covered by fluviatile gravel, moraine material, late-glacial lake deposits and postglacial formations.
Thanks to the diversity of the microclimates and soil profiles, it is possible to select the optimum combination for the various grape varieties, with Pinot Bianco, Chardonnay, Gewürztraminer and Kalterersee (Schiava) growing mainly where there is limestone gravel and mudslide rock from the Mendola massif while Sauvignon is planted on quartz porphyry, which gives the wines a minerally, almost salty, component. The south-facing moraine hill of Mezzan is used to grow most of the Pinot noir, while the sedimentary soils of the last glacial period in the vicinity of the lake are ideal for full-bodied reds such as Lagrein.