The grape variety comes from Germany. It is a white wine variety, so the name is misleading. The multi-layered berry color plays between gray, pink, red to violet, but the depth of color is not sufficient for pressing one red wine out. It is probably a color mutation of the variety Sylvaner (Green Silvaner and Red Silvaner). The Franconian winemaker Johann Kaspar Steinmann (Weingut Schloss Sommerhausen) discovered a Blauer Silvaner vine in a vineyard in 1964. After many selections, he hired one 12 years later clone available to the Federal Plant Variety Office for register inspection. This test was completed in 1984 and the Blauer Silvaner ST25 variety was entered in the variety list as a yielding cancer variety. This particular clone is owned by the nursery Steinmann, who is also registered as a conservation breeder. The medium to late ripening vine produces fruity white wines with herbal aroma. In Germany it is used, among other things, by the wineries Pforta Monastery (Saale-Unstrut) H. Deppisch and Sommerhausen Castle (Franconia) cultivated. In 2010, 38 hectares of vineyards were shown in Germany (Kym Anderson ).
The many names or Synonyms suggest that there used to be a red Silvaner red wine with dark-colored berries (Blue Lake Constance, Blue Austrian, Blue Ripe, Blue Schönfeilner, Blue Zierfahndler, Lake Constance, Black Austrian, Black Silvaner, Black Zierfandler, Sweet Black and Sylvaner Rouge). This variety was on Lake Constance and in Alsace common.
Images: Ursula Brühl, Doris Schneider, Julius Kühn Institute (JKI)