While herbarium collections and observation data have a long history of data exchange via common data portals, this has yet to happen for botanical living collections. The EvoBoGa project, which has now been completed, has created a joint data portal for two groups that are well represented in botanical gardens, bromeliads and cacti. The Palmengarten is involved with its bromeliad collection:

https://portal.wissenschaftliche-sammlungen.de/CollectionActivity/181232

Phenology describes when plants develop leaves, flowers or fruits. Climate change-induced shifts in these events can have serious effects on plants and other organisms associated with them. Phenological changes can be documented effectively on a common set of species at different sites, and this is what the PhenObs project is doing in botanical gardens:

https://www.idiv.de/de/web/phenobs.html

SLInBio examines the appreciation of insects and the contribution of cities to insect conservation using the example of the city of Frankfurt. The Palmengarten and Botanical Garden are involved with their insect-friendly habitats, citizen science and as an event venue:

https://www.isoe.de/nc/forschung/projekte/project/slinbio/