The exposed site at 3,280 feet above sea-level and the weather pattern call for harvesting in two to four passes with strict selection for optimum maturity of the grapes. After a short maceration period, the grapes are gently pressed. One half is left to ferment in a large wooden barrel and one half in concrete vats, all without the use of added yeast. The young wine is then allowed to rest on the fine lees for just under a year. After bottling, the FELDMARSCHALL VON FENNER Mülller Thurgau spends another six months maturing in the bottle. To preserve the full aromatic spectrum, the wine bottles are closed with a screw top.