The grand cru Morstein site is situated on the south-facing slope that stretches from Gundersheim to Westhofen. The subsoil consists of massive limestone rocks. The first documented mention of the site dates from 1282. Today, Wittmann owns about 4 ha (10 acres) in the best (southeastern exposure) parcel of this vineyard. The upper layer of soil is primarily heavy clayish marl interspersed with limestone. The subsoil is also heavy and marked by layers of limestone that help circulate water. This ensures that the vines are well supplied with nutrients and minerals, and may account for the mineral character of the Morstein wines.