Joh. Jos. Prüm and the Wehlener Sonnenuhr Vineyard

The Prüm family's roots in the Mosel valley stretch back to at least the 12th century, but the estate now known as Joh. Jos. Prüm took its modern form in 1911, when the original S.A. Prüm family holdings were divided among heirs. Johann Josef Prüm received his share and founded the estate that bears his name. His son Sebastian joined in 1920 and, by the mid-1930s, had forged the distinctive house style that would define Prüm wines for generations. Sebastian ran the estate until his death in 1969, after which his son Dr. Manfred Prüm took the helm. Manfred was named German Winemaker of the Year by the Gault Millau Guide to German Wines in 1996. Since 2003, his daughter Dr. Katharina Prüm has worked alongside him and today leads the estate into its fourth generation. Both Manfred and Katharina studied law before dedicating themselves to winemaking, a detail that reflects the family's intellectual, exacting approach. J.J. Prüm is a longtime member of the Verband Deutscher Prädikatsweingüter (VDP), Germany's elite association of quality-focused estates.

• Estate officially founded 1911 by Johann Josef Prüm after division of the S.A. Prüm winery
• Sebastian Prüm (1920 to 1969) built the estate's international reputation and shaped its house style
• Dr. Manfred Prüm was named German Winemaker of the Year by Gault Millau in 1996
• Dr. Katharina Prüm now leads the estate, representing the fourth generation of family stewardship

The Wehlener Sonnenuhr is one of the most famous vineyards in the world. Its name, which translates to 'Wehlen Sundial,' comes from the large sundial that Jodocus Prüm, an ancestor of the J.J. Prüm family, painted onto a prominent slate outcrop in the middle of the steep vineyard in 1842. The sundial served a purely practical purpose: giving vineyard workers a way to tell the time on the south-facing slope across the river from the village of Wehlen. It remains visible from the opposite bank of the Mosel to this day and has become an iconic symbol of the Middle Mosel. The total Wehlener Sonnenuhr vineyard covers approximately 40 hectares, all planted with over 99 percent Riesling. The VDP has designated the prime parcels within this site as a VDP Grosse Lage, the highest classification in its private vineyard hierarchy. The vineyard also received top marks in the 1868 Prussian vineyard classification under King Wilhelm I, one of the first systematic quality assessments of German wine sites. In October 2024, Wine Spectator named Wehlener Sonnenuhr one of the ten greatest vineyards in the world, placing it alongside Romanee-Conti, Montrachet, and To Kalon.

• Named after the sundial painted onto a slate outcrop in 1842 by Jodocus Prüm, an ancestor of J.J. Prüm
• Total vineyard area of approximately 40 hectares; classified as VDP Grosse Lage at its prime parcels
• Received the highest rating in the 1868 Prussian royal classification of Mosel vineyard sites
• Named one of the ten greatest vineyards in the world by Wine Spectator in October 2024

The character of the Wehlener Sonnenuhr is inseparable from its terroir. The vineyard sits on the right bank of the Mosel, facing south-southwest and rising at gradients of up to 65 to 70 percent in places, making it among the steepest cultivated land in the world. The soils are composed almost entirely of ancient Devonian slate, weathered grey and blue in color, with very thin topsoil in the steepest sections. In some areas, vine roots reach directly into pure rock with virtually no overlying soil. This slate performs two critical roles: it absorbs and radiates heat during the day, helping Riesling ripen fully in the cool Mosel climate, and it provides exceptional drainage, forcing vines to root deeply in search of water and nutrients. The result is naturally low yields, concentrated flavors, and wines with a piercing, stony minerality that is the hallmark of the site. J.J. Prüm's holding of approximately 5 hectares within the Sonnenuhr includes some of the estate's oldest ungrafted vines, many averaging 60 years of age with select parcels exceeding 100 years. The combination of old vines, pure slate, and extreme slope creates the conditions for what many regard as the quintessential expression of Mosel Riesling.

• Slopes of 65 to 70 percent gradient; soils of ancient Devonian slate with very thin topsoil over bedrock
• Slate absorbs and radiates heat, enabling ripeness, while providing exceptional drainage and low natural yields
• J.J. Prüm holds approximately 5 hectares of Wehlener Sonnenuhr, with south-southwest exposure
• Many vines are ungrafted, averaging 60 years of age with some parcels over 100 years old

The winemaking at J.J. Prüm is deliberately unhurried and rooted in tradition. Fermentation is conducted almost entirely with indigenous yeasts, a practice that gives young Prüm wines their distinctive 'sponti' character: a smoky, reductive, sulfurous quality that Katharina Prüm describes as a 'wildness,' reminiscent of struck matches and wet slate. This is not a flaw but a signature, a veil of youth that fades with bottle age to reveal extraordinary complexity and freshness. Grapes are hand-harvested with multiple passes through each parcel to select fruit at precise ripeness levels for each Pradikat. After gentle pressing, wines ferment in stainless steel tanks and are then aged in traditional large-format old oak casks (Fuder) on their lees. The estate does not publish technical data sheets, but is known for late harvest dates and a preference for wines with residual sweetness. Manfred Prüm has been open about his disinterest in producing legally dry wines; the house style favors off-dry to nobly sweet expressions that the family believe best express the Sonnenuhr terroir. The wines are bottled relatively late and the Prüms advise drinking even their Kabinetts with at least a decade of bottle age.

• Fermentation is entirely spontaneous with indigenous yeasts, producing the characteristic 'sponti' reductive aromas in youth
• Grapes are hand-harvested in multiple passes; wines age on lees in traditional large-format old oak Fuder casks
• The estate specializes in off-dry to nobly sweet Pradikat wines; Dr. Manfred Prüm has long been uninterested in producing dry-style Riesling
• Even Kabinett wines benefit from a minimum of 10 or more years of bottle ageing before the Prüm family considers them ready

One of the most practical pieces of knowledge for any wine professional dealing with J.J. Prüm is understanding the estate's Goldkapsel (gold capsule) system. Before the 1971 German Wine Law, producers could label Auslese wines with qualitative sub-categories such as 'Feine Auslese' or 'Feinste Auslese' to indicate greater concentration. The 1971 law abolished these distinctions, leaving estates with only a single Auslese category that in reality spans a very wide range of ripeness and botrytis. To fill this gap, estates like J.J. Prüm developed an informal color-coded capsule system. A standard Auslese from J.J. Prüm carries a white capsule. A Goldkapsel (gold capsule with a single white stripe) denotes a richer, more concentrated Auslese, typically boosted with botrytised grapes. A Lange Goldkapsel (long gold capsule with two white stripes at the bottom) indicates a wine with a much higher percentage of botrytis, closer in style to a Beerenauslese. Beerenauslese, Trockenbeerenauslese, and Eiswein are always bottled under the Lange Goldkapsel. This system is entirely outside German wine law and is a house convention, not a legally defined designation.

• The 1971 German Wine Law eliminated sub-categories of Auslese, prompting estates to invent informal distinction systems
• Goldkapsel (single white stripe on gold capsule) signals a richer, more botrytis-influenced Auslese bottling
• Lange Goldkapsel (two white stripes on long gold capsule) indicates a very high botrytis content, approaching Beerenauslese in character
• BA, TBA, and Eiswein are always released under the Lange Goldkapsel; this is a house convention, not a legal designation

Few producers anywhere in the world can match the ageing potential of J.J. Prüm's wines, and this longevity is central to the estate's identity. The combination of naturally high acidity, residual sweetness, low alcohol, and the mineral precision of the Sonnenuhr slate creates wines that can evolve in bottle for decades. Spätlese and Auslese wines may not approach their peak for 20 to 30 years, and well-kept Beerenauslese or Eiswein can remain shockingly vibrant for far longer. The Prüm family does not consider even their Kabinetts ready to drink with fewer than 12 or more years in bottle. Because young Prüm wines are often tightly wound with their characteristic reductive 'sponti' aromas, decanting is frequently recommended when opening them early. The estate's annual production of approximately 10,000 to 13,000 cases, drawn entirely from Riesling across five Middle Mosel sites, is highly sought after by collectors worldwide. The wines have become benchmarks not only for Mosel Riesling but for the concept of ageworthy white wine in general, demonstrating that great Riesling can outlast, and outlive, nearly any white wine on earth.

• Spätlese and Auslese may require 20 to 30 years of cellaring to approach their peak; BA and Eiswein can evolve for far longer
• High natural acidity, residual sweetness, and low alcohol are the structural pillars behind the wines' extraordinary longevity
• Annual production is approximately 10,000 to 13,000 cases, 100 percent Riesling across five Mosel vineyards
• Decanting is often recommended for young vintages to dissipate the reductive 'sponti' character from indigenous yeast fermentation