The white grape variety (also Geisenheim 9-93) is a new breed between Riesling x Knipperlé as published in the 2012 year DNA analysis, The paternity of Grüner specified in the breeding list Sylvaner turned out to be wrong. The name derives from the ruins of Ehrenfels near Rüdesheim. The crossing took place in 1929 Geisenheim by Dr. Heinrich Birk (1898-1973). The variety protection was issued in 1969. The variety was a cross partner of the new varieties Ehrenbreitsteiner and principal, It is resistant to frost and moderate against real and false mildew, The vine produces greenish-yellow white wines with aromas of apple, peach and apricot similar to Riesling. In Germany it occupies 85 hectares with a strongly falling trend. There are also other stocks in Canada (29 ha), as well AustraliaEngland and in some US states like California and new York, In 2010 a total of 114 hectares of vineyards were reported.
Images: Ursula Brühl, Doris Schneider, Julius Kühn Institute (JKI)