It is banal statement that ecological knowledge is relevant for landscape architecture. The landscape architect designs with organisms (mostly plants),and if he wants to design successfully, he must know something about organisms and their relationships to their abiotic and biotic environments. Hence, the objects he designs are somehow always ecological systems. To focus on entire landscapes as ecological systems explicitly is not as self-evident. It is accompanied by a shift in the theoretical point of reference from autecology to synecology or from the individual organism to the ecological community. Among the theories of synecological systems, there is especially one that is very popular beyond ecology, e.g., in landscape architecture the so-called “Odumian” ecosystems theory.