An apparatus for a vertical or angled arrangement of hydroponic cultivation of plants includes at least one module defining an inner space containing at least one nutritional substrate and plant. The module includes a front wall and a rear wall secured to the front wall. At least the front wall includes at least one opening for the plant to pass through. The front and/or the rear wall includes an attachment area for attaching the module to a mounting. The front wall and/or the rear wall has overlapping edges enabling, when the apparatus is installed on a green roof or a green wall with at least two adjacent modules, overlapping of the modules, at least partially.
