The invention relates to a soilless plant-growing system (100), the plants being arranged in a support structure (110) comprising a plurality of closed spaces, such that the roots of each plant are in one of the closed spaces, the system (100) comprising: - a spray head (1) comprising at least one spray nozzle (2) comprising a piezoelectric sprayer, - means for supplying at least one plant nutrient solution, - movement means (3, 10) arranged to move the spray head (1) between the closed spaces, and - control means arranged to: - control the at least one nozzle (2), - control the movement means (3, 10) so as to move the spray head (1) between the closed spaces, the spray head (1) being arranged to spray the nutrient solution into each closed space for a predetermined time and with a predetermined frequency.
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