PROBLEM TO BE SOLVED: To provide a plant displaying device that can keep fresh plants as they are shown for a long time, and to provide a method for showing plants.SOLUTION: This plant displaying device is a display device for showing plants, and includes a tank part 3 for showing plants and storing in the inside liquid manure 7 for plant hydroponics, and a growth suppressing means 8 delaying the growth of plants cultivated in the tank part 3.