Viresco®is a bio-tissue compound by a layer of celluloselly fibres, inside of which vegetable species’ seeds are deposited and fixed so that they don’t modify their position during the operations of laying and in the following phasese. The particular conformation of the bio-tissue allows to insert inside seeds of different dimensions and others materials, for exemple fertilizers. The use of Viresco® includes laying and sprinkling with water to help the adhesion to the surface of the ground and the germination. To test the possibilities offered by the new product, an experience of regrassing of a difficult area has been carried out between october 1995 and september 1996, in Colli Euganei in Padua. This area is characterized of considerable gradient (100%), position to N and substratum made of altered rock.