The Botanic Garden usually puts on an exhibition relating to current or particularly relevant botanical themes every other year. Past exhibitions include:
2009 Darwin's Garden - Discover Evolution
2007 Gather, Explore, Preserve - 60 years of the Botanic Garden in Mainz
2005 The evolution of land vegetation
2003 Tropical crop plants
2002 The search for the dove tree
2001 Plants of the Bible
2000 Crop plants through the ages
1999 Scented plants
1998 Endangered plants in Rhineland-Palatinate
1996 The poppy
Guided tours of all the above exhibitions are still being offered.