The white grape variety is a new variety between Silvaner x Pinot Gris (which was confirmed by DNA analyses published in 2012). Synonyms are Freiburg 25-1 and (in Switzerland) Freiburger. The cross was made in 1926 by the vine breeder Karl Müller (1881-1955) at the State Viticulture Institute in Freiburg (Baden-Württemberg). The first name was Freiburger, which was then changed to Freisamer in 1958. The second name is derived from Freiburg and the small river Dreisam which flows through the city. The breeding goal was a fungus-resistant PIWI variety as an alternative to the Ruländer (Pinot Gris), which has since been greatly improved by clone selection. Therefore, the importance of Freisamer has decreased extremely. The medium to late-maturing vine produces acidic white wines. It is cultivated in Germany (3 ha) and Switzerland (5 ha). In 2016, a total of eight hectares of vineyard area were designated (statistics D-STATIS and Kym Anderson). A small stock is also supposed to exist in England.