Abstract: A method for installing a cultivation floor system including a floor on which plant containers are placed, and an ebb/flood watering installation which is configured to alternately cause a supply of water to the cultivation floor and a discharge of water from the cultivation floor. The method includes: providing a watertight basin; placing one or more irrigation lines in the basin, which irrigation lines provide outflow openings along their length to enable water to flow from the one or more irrigation lines; providing a water pump and connecting that water pump to the one or more irrigation lines; providing a water-permeable structure in the basin, which structure has a permeable and horizontal top which forms the floor on which plant containers are placed, which structure comprises one or more layers of granular material, wherein the one or more irrigation lines are covered by the permeable structure.