Germany -September 2023
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Germany -September 2022
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Germany -June 2021
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Germany - October 2019
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Germany - June 2019
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Germany - August 2018
Botanic Garen of Hannover, Braunscheig, Potsdam, Chemnitz, Leipzig, Jena
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Germany - August 2017
Botanic Garen of Weinheim, Stuttgart,Schachen, Munich
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Germany - August, September, October 2016
Botanic Garen of Bremen, Münster, Ulm, Tübingen, Heidelberg
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Germany - October 2013
Botanic Garen of Linz, Botanic Garden of Munich, Botanic Garden of Freiburg
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Germany - September 2008
Botanic Garen of Göttingen, Botanic Garden of Hannover, Dahlem Botanic Garden of Berlin, Späth Arboretum in Berlin
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Switserland - October 2007
Botanic Garden of Fribourg, Botanic Garden of Basel
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Austria - April 2003
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Germany - August 2001
Palmengarten in Frankfurt
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Switserland - May 1992
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Germany and Austria - August 1989
A trip along the iron curtain
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