The transformation of the industrial territory of Nord Franche-Comté (NFC) requires the management of its past and its old industrial sites, often located in the heart of the city and in the flattest zones corresponding to the Allan and Doubs river alluvial plains.

Their number will increase in the coming years given the changes in the production apparatus and the implications of Industry 4.0 (reduction of production areas, land releases, increasing integration of factories). The low value of these marginalized lands, in a context of a relaxed real estate market, does not spontaneously encourage their reclaiming, but rather promotes peri-urbanization, the artificialization of agricultural land, long commutes to work and the devitalization of centers. Phytomanagement (management of polluted lands by plants) is one of the alternatives to very expensive excavation and can contribute to the development of accessible solutions for the restructuring of sites by giving them multiple uses: housing, trade, rational economic spaces, public spaces for amenities, energy production.