The vineyard "St. Johannishof Dr. Loosen" is located in the community of Bernkastel-Kues in the German Mosel wine growing region. It has been family-owned for more than 200 years, with connections to the famous wine dynasty Prüm. Dr. Paul Loosen (1924-2001) held a number of important wine offices. In 1967 he was a founding member of the Mosel-Saar-Ruwer wine brotherhood and held the office of brotherhood chancellor for 25 years. He was awarded the Federal Cross of Merit for his achievements in German viticulture. After many visits to important wineries all over the world, the business was taken over by Ernst F. Loosen in 1988. As one of the first measures a rigorous yield limitation was introduced.
The vineyards comprise 22 hectares of vineyards in the individual locations Himmelreich (Graach), Lay (Bernkastel), Prälat und Treppchen (Erden), Sonnenuhr (Wehlen), and Würzgarten (Ürzig). They are 98% planted with Riesling, 98% of which are grown with unrooted vines and are 60 years old on average, some of them even more than 100 years old. The small remainder is Pinot Blanc. The vineyard is cultivated according to the principles of sustainable, non-invasive (minimalist) viticulture with exclusively organic fertilization or without chemical fertilizers. The grape harvest is carried out selectively in many manual harvest rounds. The legally prescribed Oechsle degrees are exceeded at all Prädikat levels. Only the Großes Lagen receive a site designation, all others are marketed as estate wines.
Depending on the degree of ripeness, Prädikat wines without botrytis are divided into three quality classes: Kabinett (normally ripened grapes), Spätlese (higher degree of ripeness) and Auslese (selected grapes partially affected by botrytis). The noble rot grapes are meticulously selected and from these the three quality classes Auslese-Goldkapsel (highly ripe grapes), Beerenauslese (grapes shrunk by about half) and only Trockenbeerenauslese (from raisined grapes) are produced. Ice wine is also pressed in years suitable for the weather. The winery has been a member of the VDP (Verband deutscher Prädikatsweingüter) since 1993. Two wines are regularly contributed to the annual VDP auction: the Rieslings "Ürziger Würzgarten Spätlese Goldkapsel" (from the oldest vines) and "Erdener Prälat Auslese Lange Goldkapsel". Every year, around 180,000 bottles of wine are produced, which are sold in over 50 countries worldwide.
In 1996, the Palatinate winery J. L. Wolf was taken over, which today operates under the name of Villa Wolf. Together with winemaker Jay Christopher Somers, the J. Christopher Winery has been operating in Newberg near Portland in the US state of Oregon since 2010. There is a joint venture with the Château Ste Michelle winery in Washington State, where only Riesling wines are produced.