The traditional family business is located in the municipality of Vogtsburg-Oberbergen in the German wine-growing region of Baden. It comprises the "Franz Keller" winery, the "Schwarzer Adler" restaurant, the "Schwarzer Adler" hotel, the "KellerWirtschaft" restaurant, the "Winzerhaus Rebstock" winery and an import wine trade. For decades, winery senior Franz Keller set the tone as a feared opponent of the large-scale land consolidation in 1971, in his pioneering role in the introduction of the Pinot Gris, and as a promoter of barrique age ing and fully fermented, dry wines. Today, the winery is run by Fritz Keller and his son Friedrich Keller.
With a history spanning over a hundred years, the wine trade forms an important pillar of the company. First-class Bordeaux and Burgundy wines from the most prestigious wineries are still among the trademarks today. The restaurant "Schwarzer Adler" has been awarded a Michelin star since 1969. In addition to a large selection of wines from the restaurant's own vineyard, you can choose from around 2,700 positions of France's best wines as well as German and international classics. The "KellerWirtschaft" offers modern, internationally inspired cuisine. In addition to the view into the wine press house, you can enjoy a fantastic view of the typical Kaiserstühl terraced landscape as well as the Badberg nature reserve. In the "Rebstock" winegrowers' house, the cuisine has a Baden-Alsatian flavour.
The vineyards cover 35 hectares of vineyards in the single vineyard sites Bassgeige (with the vineyards Im Leh and Kähner) and Pulverbuck (Oberbergen), Eichberg (Oberrotweil), Enselberg (Jechtingen), Kirchberg (Oberrotweil) and Schlossberg (Achkarren). They are planted with the white wine varieties Pinot Gris, Pinot Blanc, Chardonnay and Müller-Thurgau, as well as the red wine varieties Pinot Noir, Merlot, Cabernet Sauvignon and Lemberger (Blaufränkisch). Environmentally friendly, gentle viticulture is practised with organic fertilisation, exclusively mechanical soil cultivation and cover crop for the purpose of natural humus supply. Quality-enhancing yield reduction is achieved by thinning out and dividing the grapes.
The winery building is sunk several storeys into the loess. Processing is done by gravity. The white estate wines are vinified in stainless steel, the white wines of the Oberbergener Bassgeige VDP. Erste Lage are vinified in traditional large wooden bar rels and stainless steel tanks, the Grosses Gewächse in traditional large wooden barrels or in Burgundian pièce-barrique barrels, and the Pinot Noirs in barrique.
Following the VDP classification model, the extensive product range is divided into the lines "Jeden Tag" (cuvées for every day, light uncomplicated wines), estate wines (from loess-dominated, lighter soils), Erste Lage (Bassgeige and Pulverbuck), Franz Anton (cuvées from old vines at various altitudes, as a tribute to Franz Anton Keller) and Grosse Lage(Grands Crus from the volcanic rock, made from the best, strictly selected grapes from the Schlossberg, Kirchberg, Eichberg and Enselberg sites, as well as the "Im Leh" and "Kähner" vineyards). Around 400,000 bottles of wine are produced annually. Other products are bottle-fermented sparkling wines and noble brandies (fruit, marc). The winery is a member of the VDP (Association of German Prädikat Wine Estates).