Vineyard Location & Terroir: In 1845, Jodocus Prüm had the now world-famous sundial built on a rock in the Lammerterlay region. It was originally intended as a means of orientation for vineyard workers. The site faces south-southwest and has a slope of up to 70%. Our Riesling vines are up to 80 years old. Terroir: Stony, weathered clay slate soil.