The object of research in this paper are industrial landfills, i.e. finding the best way to change their purpose and turning them into useful areas. As a method, bioremediation was chosen, i.e. planting of certain biological species in order to change the composition of the soil. Paulownia elongata was selected from the biological species. For the purpose of the research, the location was selected and the plant species planted in the appropriate industrial substrate (ash created by burning fossil fuels) and its change in chemical composition and morphology during the two years of vegetation was monitored.