Provided is a watering device for a plant culturing device that can improve maintainability of the plant culturing device by inhibiting adherence of culturing water to constituent members of the plant culturing device and spraying the culturing water on plants in culturing trays and that can cut back on the amount of culturing water consumed and production costs for plants. A plant culturing device (100) is provided with: a plant culturing repository (105) that has culturing racks (106) that accommodate culturing trays (101) a watering device (W) and an in and out rack (120) on which a culturing tray (101) to be irrigated is mounted. The watering device (W) has a spray nozzle (145) that sprays the culturing water on plants (P) and a cover (130) that prevents spreading of the culturing water sprayed by the spray nozzle (145). The cover (130), which forms an irrigation chamber (Ri), covers the entirety of the plants (P) in a plane view and also extends downwards toward the culturing tray (101) from a ceiling wall (131) such that lower end parts of side walls (132) of the cover surround the entirety of the plants (P). The spray nozzle (145) sprays the culturing water inside the watering chamber (Ri).La présente invention concerne un système darrosage pour dispositif de culture de plantes ayant pour effet daméliorer la maintenabilité de ce dernier en inhibant ladhérence de leau darrosage aux éléments constitutifs du dispositif de culture de plantes et en pulvérisant leau darrosage en direction des plantes installées sur des plateaux de culture, ledit système ayant, par ailleurs, pour avantage dentraîner une baisse de la quantité deau darrosage consommée et, par conséquent, des frais de production des plantes. Un dispositif de culture de plantes (100) est équipé dune structure de culture de plantes (105) comportant des étagères de culture (106) pouvant accueillir des plateaux de culture (101) dun système darrosage (W) et dune étagère mobile (120) sur laquelle un platea
