A container with diffuse and extended irrigation for cultivating plants, which includes porous regions in the containment walls, which are arranged in contact with the soil of a plant, and a water reserve for supplying the porous regions. The container further includes a waterproofing layer for covering the porous regions, in their parts that are not in contact, for preventing the water from being lost by evaporation from the porous regions toward the outside of the container. The invention solves the problems of conventional containers, providing the soil with the right amount of moisture in an extremely simple manner for several days, accordingly avoiding periodic watering.