The roof garden of the “Technoseum” in Mannheim, formerly known as the “State Museum of Technology”, is located on the first floor roof of the building and is part of the exhibition. Originally a conventional three-year crop rotation was presented on the roof area, which later was turned into a allotment garden. The caretaker of the “Technoseum” maintains the roof garden affectionately so everything grows and prospers. The museum’s staff is regularly supplied with fruits and vegetables by him. As a basis for the green roof first the drainage and water storage elements of the Floradrain® FD 60-type were laid on the entire roof surface. The growing medium consists of the system substrate “Roof Garden” with a additional layer of humus. The total substrate height varies between 200 and 700 millimetres.