The device (10) of a water or of a plane of the water has: - a craft (105) supporting a mill, - the mill (110) to be ground of the plants that are present in the course of water or in the plane of water comprising an input (115) for plants and an output (120) for plants ground and - a container (125) to be floating, connected to the output of the mill in order to collect the chips of plants ground.
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