20 raised beds from CampusPlus are distributed across the campus. This means that you can create your own small beds with plants, vegetables, etc. on campus. They are partly public, so that you can simply help yourself there, and partly private. These can be rented by a person or a group to grow their own lettuce or similar.
The rental is for one year and is free of charge! If you are interested in a raised bed, just send an email to info-campusplus@uni-kl.de.
Tip: The nursery's plant exchange sells inexpensive plantlets.