System for Forming a Vegetative Textile Element

A system for forming a vegetative textile element comprising a first impermeable layer having a back face and a front face, a second layer comprising a synthetic felt provided with a water retention capacity and having a back face and a front face, said back face of said second layer facing said front face of said first impermeable layer and a third layer of synthetic polymer having openings as well as a back face and a front face, said back face of said third layer facing said front face of said second layer comprising a synthetic felt,

• wherein said first impermeable layer is a flexible polymer canvas have a density comprised between 300 and 1200 g/m2, and in that said third layer is a flexible polymer grid, said first and third layers being welded to each other on their perimeter in order to ensure the sealing of said system to form a vegetative textile element, said watertight weld being compatible with the materials used to form the different layers.