since, owing to the changed production conditions in modern agriculture, the grasslands in the "sieken" have become economically largely superfluous, many unused "sieke" would become marshy again in the long term without mowing and maintenance and turn into black alder carrs. conservation and cultural landscape management today have the task of ensuring a balanced relationship between renaturalising "sieken" on the one hand and regularly mown grassland "sieken" on the other. an example of protected "siek" systems is the kilverbach valley () and the wöhrener siek in ravensberg land.