During restoration work at the medieval castle of Marmorera, Graubünden canton, Switzerland, numerous desiccated plant remains were found ? in a rock crevice that was protected from precipitation by a massive rock shelter. The identification of the remains showed that the majority could not have grown at the castle, but must have been transported to the site. Many of the plants came from warmer climates and were imported from lower lying regions, indicating the position of the castle at an important transalpine route. Among the finds was a lump of grass-like leaves for which for a method of preparation and identification was developed. The leaves turned out to be of Carex species that grow in wet habitats which were probably used as litter or as bedding material.