The agriculture of Shodosima Island, Kagawa prefecture suffers damage almost every winter due to water shortages.A possible countermeasure to this problem is to utilize water vapor condensed on the glass of greenhouse for irrigation purposes. To this end, the experiments were carried out to evaluate the quality and the yield of condensed water vapor from different parts of the greenhouse. It was found that the majority of water was obtained from the roof of the greenhouse with little arising from the side and gable end. The maximum daily amount of collected water was 0.026 m^3 and the pH of collected water on the cleaned glass ranged from 6.5 to 7. These results have demonstrated that such a solution to the annual winter drought problem is possible but only if used together with trickle and interval irrigation.