The Wehlener Sonnenuhr vineyard has become intrinsically attached to the name of Joh. Jos. Prüm. The Estate owns seven hectares of this majestic site—largely planted to ungrafted wines (in fact 90% of the Estate’s vines are ungrafted). Here the thin, rocky Devonian slate (in some areas of the vineyard the plants grow out of pure rock) fashion some of the Mosel’s greatest wines. Riesling guru Stuart Pigott has written: “Joh Jos Prüm’s Sonnenuhrs are classic examples of the way in which the best Mosel wine’s natural sweetness magnifies, rather than obscures, their character. These are a perfect marriage of Riesling’s peach-like, floral and mineral aspects. White wine cannot be fresher, more vivid and delightful.” Along with the neighbouring Zeltinger Sonnenuhr, this is the steepest of Prüm’s vineyards—a dizzying 65-70% gradient.