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For many people,it is difficult to evaluate the time and amount for watering a plant. The moisture content in the soil may be excessive or insufficient due to frequent watering or lack of care. We designed easy-hygrometer which can tell users when to water through indicating the water content in the soil by the small purple flower withered or blossoming. We chose a thin film that can change its shape under various moisture to make a structure of small flower. The small flower will deform due to various humidity owing to the siphon effect that allows the water reaching the appearance of small purple flower through the long tube.