This consists in a device made up of a box made of cardboard or permeable or impermeable plastics, or fitted with holes and with an impermeable base, which contains a cellulosic substrate, preferably cereal straw, in which vegetative stages of the mushroom can be inoculated or arranged to enable appropriate growth, preferably mycelia or spores, of the Pleurotus, Agaricus, Shiitake (lentinus edodes) genus, through holes, said holes being arranged preferably under pre-cut bands which can be removed to start growth as well as used for inserting nutrients, plant hormones and appropriate pesticides. This box has handles, and the device is sterilised or has received a treatment commonly applied for elimination of micro-organisms and/or pests, not required for growing the mushrooms. <??>For application in mushroom growing. <IMAGE>
