Fecha de publicación: -- Fuente: WIPO "tomato" A growing medium includes a particulate material defining a volume of particulate material. The particulate material comprises particles having a range of particle sizes. The concentration of smaller particles of particulate material increases from the bottom of the volume of the particulate material to the top of the volume of the particulate material. The concentration of larger particles of particulate material decreases from the bottom of the volume of particulate material to the top of the volume of particulate material.