[Problem] To easily produce a wall-surface greening material suitable for wall-surface greening with respect to a wide area of a building. [Solution] This method is for producing a wall-surface greening material that is arranged along a wall-surface part of a building in order to green said wall-surface part, the wall-surface greening material comprising: a climbing plant (11) that develops holdfast roots from a point partway of the stem of the plant a bottom end pot (12) containing a culture medium in which normal roots of the climbing plant are enrooted and a lower-side intermediate pot (13) arranged at a point partway of the stem and containing a culture medium in which the holdfast roots are enrooted. The method is characterized by involving: a first step of growing the stem of the climbing plant (11) while letting the stem hang down in a state where the bottom end pot (12), in which the normal roots have enrooted in the culture medium, is placed on a shelf (61) a second step of holding the tip-end part of the stem, which is hanging down, in a state where the tip-end part is pressed against the culture medium in the lower-side intermediate pot (13), which is placed on the ground surface, until the holdfast roots enroot in the culture medium and a third step of growing the stem while letting the stem hang down in a state where the lower-side intermediate pot (13) has been moved to a high place on the shelf (61).Linvention vise à produire facilement un matériau décologisation de surface de paroi apte à écologiser une surface de paroi vis-à-vis dune grande surface dun bâtiment. A cet effet, linvention porte sur un procédé pour produire un matériau décologisation de surface de paroi, lequel matériau est disposé le long dune partie de surface de paroi dun bâtiment afin décologiser ladite surface de paroi, lequel matériau décologisation de surface de paroi comprend : une plante grimpante (11) qui développe des racines tenaces à partir dun point à mi-chemin de la tige
