Wehlener Sonnenuhr represents Joh Jos Prum's premier vineyard—a steeply terraced site climbing to 70% gradient on the Middle Mosel's south-southwest-facing slopes. The vineyard's celebrated geology comprises deep, weather-beaten grey Devonian slate with minimal topsoil, demanding intense manual labour yet yielding wines of exceptional mineral character. The Prüm family's century-old tenure here has refined their understanding of optimal ripeness timing for each site. The 2022 growing season—marked by warm May growth, sustained summer heat, and early fruit maturation—allowed the estate to achieve full Auslese-level ripeness (higher Oechsle values indicating noble, ripe character) whilst preserving the acidity and aromatic complexity essential to these premium wines.

Auslese-level fruit, harvested in mid-September 2022 at elevated ripeness, underwent gentle pressing to preserve juice quality without excessive extraction. The estate's rigorous spontaneous fermentation proceeded in stainless steel without any added yeast, allowing native microflora to develop the wine's profile slowly. Extended maturation on fine lees—typically lasting months—encouraged the development of yeasty, floral complexity characteristic of noble Mosel Rieslings. The resulting wine balances the 2022 vintage's preserved freshness with the higher residual sweetness appropriate to Auslese classification, yielding a wine of delicate but pronounced character.