The invention relates to a cultivation substrate with integrated irrigation, in particular for the cultivation of a roof, characterised in that it comprises a first ply (10) of fibres of a plant material, at least one fluid supply duct (12), a ply (14) for reinforcing and maintaining the at least one duct, and a second ply (16) of fibres of a plant material, wherein the first and second plies (10, 16) are linked by carding.
