Last autumn, we organized a "relaxing" activity for colleagues from our department, during which we weeded the sand dune at the faculty garden. The reason was that the reopening of sandy patches is necessary not only to support the desired vegetation, but especially the solitary bees and wasps. And how does the sand dune look like now? In some places, small rosettes of the small cudweed (Filago minima) and the dwarf everlast (Helichrysum arenarium) can already be seen. However, it was almost impossible to work on the sand dune, as solitary bees buzzed and crawled everywhere.