This culture is carried out either on mobile and extensible supports, or on networks of radiating divergent wires covering the containers, or else on mixed supports combining the two. The plants are movable and separated by increasing intervals. The granules 100 come from a silo 8, are lifted by compressed air 9 through a tube 11, come to 2, 2 bis, pass through the floor 3 via the tubes 4 whose axes are inclined and divergent, fill the containers 5 and entrain the young plants 14 to the harvesting zone 7, and are then pushed either by the tubes 4, or by rotating cylinders and pass through screens 13 and return to the silo 8 via the hoppers 12 and pipes 15. The seeds and young plants grow as they move from position 6 to position 7 where they are harvested. Overhead supports 23 having platforms 27, sweep the whole of the surface of the containers 5.
