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Ehrenfelser is a white wine grape variety of German origin. It was created by Dr. Heinrich Birk (1898-1973) at the Geisenheim Grape Breeding Institute in 1929, by crossing the varieties Riesling and Silvaner, with the identification of Silvaner being somewhat uncertain.〔(Vitis International Variety Catalogue: Ehrenfelser ), accessed on May 16, 2008〕〔(Wein-Plus Glossar: Ehrenfelser ), accessed on January 22, 2013〕 Ehrenfelser is grown primarily in the Palatinate and Rheinhessen regions in Germany〔 Oz Clarke ''Encyclopedia of Grapes'' pg 88 Harcourt Books 2001 ISBN 0-15-100714-4 〕 with some experimental plantings in Washington State.〔 Robert Irvine & Walter Clore, ''The Wine Project'', pg 435 Sketch Publications 1997 ISBN 0-9650834-9-7 〕 However, as is the case with most white German "new crosses", plantings within Germany have decreased considerably in recent years. In 2006, only of plantings remained,〔(German Wine Institute: German Wine Statistics 2007-2008 )〕 down from in 1999.〔(German Wine Institute: German Wine Statistics 2004-2005 )〕 Several vineyards in the Okanagan Valley of British Columbia also grow Ehrenfelser, including at least Cedar Creek, Lake Breeze, Gray Monk, Gehringer Brothers, Mount Boucherie, Quails' Gate and Summerhill. The grape tends to ripen earlier and produce higher yields than Riesling but its quality is not on par with that of this, its parent grape. The variety normally consistently produces grapes of at least Kabinett level ripeness and tends to produce well in vineyards where Riesling has difficulties.〔 Jancis Robinson, ''Vines, Grapes & Wine'', pg 252 Octopus Publishing 1986 ISBN 978-1-85732-999-5 〕 Ehrenfelser derives its name from the Burg Ehrenfels ruins located on the Rhine near Rüdesheim.〔 It is also known under the synonym Geisenheim 9-93.〔 Ehrenfelser was crossed with Reichensteiner to create Ehrenbreitsteiner. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ehrenfelser」の詳細全文を読む スポンサード リンク
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