The device is assembled of a compost bunker (2) joined to a dispensing unit, a conveyor belt (5) for the transport of the flower pots (1), and two turntables (3) with planting cavity producing elements arranged above them. Two safety doors (6) are attached to the front of the device in order to protect the people working close to the device from being injured by the fast rotating turntables (3). The doors (6) are assembled of a multitude of horizontal slats, facilitating the worker to watch the production process while still being protected.