the invention relates to a device for mulching on water supply for the cultivation of plants, characterised in that it consists of:(a) (1) comprising a surface mulch cover and dense environment, (2) is permeable to water and extending around a central aperture (3), is carried out in a cover comprising a deformable material and is radially (4) in order to remove the two als amount (2a, 2b) for positioning around the stem of a plant, and- on the other hand, a drip system (6) comprising a water supply (7) disposed below the surface of the cover and enclosure of the pool cover, comprising two side walls (8a, 8b) and a bottom with holes spaced reduced diameter, the res reserve of water is driven by the water passing through the cover.and it has a radial cut in order to remove both ends, so as to enable its positioning around the stem of the plant.