Architecture enters an indivisible symbiosis with nature in the work of Ludwig Mies van der Rohe. Mies wanted to “bring nature, buildings and people together in a higher synthesis”. Haus Lange and Haus Esters are both in this way Gesamtkunstwerks. The 11th krefelder architekturtage will explore the original garden concept, devote itself to the actual range of flora, inquire into the architect’s concerns regarding a poetics of nature, and study Mies’s understanding of nature within the framework of the historical developments: from garden reform around 1900 to middle class gardening in the 1920s.