The garden contains about 170 species of carnivorous plants, one of the largest such collections in Germany, as well as good collections of Euphorbia (300 species), Mediterranean plants (250 species), Haworthia and Aloe (65 species), as well as Aeonium, Conophyllum (40 species), Rhipsalis, and rare plants from Socotra.
An unfortunate consequence has been that the homonym Cassytha Mill. (1768) is often mentioned as a synonym of the genus Rhipsalis, although this perception is incorrect, since the generic name Cassytha had already been applied to a completely different genus in a different plant family.