The utility model relates to the field of botany and forestry and is intended for carrying out research work in the field to determine the size of vegetative and generative parts of plants during their growth. The technical result is to increase the ease of use and reduce the complexity of work in determining the size of plants by simplifying the installation background lining without the use of additional fasteners while ensuring its reliable attachment and eliminating the possibility of displacement of the background lining at the time of placing the plant to be studied on the device in front of the screen. The device for fixing the seasonal growth of plants consists of a frame, a transparent vertical screen, movable intermediate and rear walls. In this design, between the vertical screen and the intermediate wall, installed with the possibility of changing the distance between them and pressed against each other by a compression spring, the required background lining from the kit is installed, which are stored in the cavity between the intermediate and rear walls.
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