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In a present deteriorated by the anthropocentric illusion of domination over Nature, imagining the change of a landscape in a perspective of coevolution is part of a broader contemporary movement of scientific and social culture. The conditions and dynamics of a plain area belonging to the Ombrone stream in Pistoia are emblematic as a case study for the criticalities and risks they present. It is intuitive that the transformation of the area into an urban park can be an effective antidote to its current inability to respond to contemporary needs, but how such a process can be initiated and sustained is a question with many significant variables. This article proposes some research results relating to the design of the plant change of places as a possible cornerstone of a process of generating the park understood as a co-evolutionary response based on the properties of the landscape to which it belongs.