Irrigation system for potted plant, has thin soil decorative layer formed on expanded filling mater

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The system has a window box (1) provided on a bottom part of a reservoir. An irrigation fluid (4) is filled inside the reservoir. A support unit (3) is provided inside the box for supporting plant pots (2). Height of upper edges (22) of the pots is less than height of an upper edge of the box. An expanded filling material (11) is provided on a space that is formed between a pot wall and a box wall. A thin soil decorative layer (12) is formed on the filling material.