This study examined the effects of the fragrance of lemons on increasing concentration and decreasing stress in the in the elderly with geriatric disease in a nursing home. This study was conducted 24times from Jan15. 2004 to July22. 2004 The program was distinguished between the group of control and lemon treatment. The group of control was conducted just horticultural therapy. The group of lemon treatment was run parallel horticultural therapy with the treatment of fragrance of lemons. Blood pressure was measured to distinguish between hypertension and hypotension. The result of hypertension people in the group of control was that systolic blood pressure was 134.3 as average before horticultural therapy and 134 after horticultural therapy. The pressure after horticultural therapy was more -0.3 different than the before. Diastolic blood pressure was 74.3 before and 72.7 after. The pressure after horticultural therapy was more -1.6 different than the before. The result of hypertension people in the group of lemon treatment was that Diastolic blood pressure was 134 as average before lemon treatment and horticultural therapy and 131.3 after lemon treatment and horticultural therapy. The pressure after horticultural therapy was more -2.7 different than before. Minimum blood pressure was 72 before and 72.3 after . The pressure after horticultural therapy was more +0.3 different pressure than the before. The result of hypotension people in the group of control was that systolic blood pressure was 111.3 as average after horticultural therapy. It was not so different between before and after. Diastolic blood pressure was 64.3 after therapy. The pressure was more +1.6 different pressure than the before. In case of pulse rate, the group of control was 79 as average before horticultural therapy and 78.7 after. The pressure was more -0.3 different average than the before. In contrast, the group of lemon treatment was 73.8 before the therapy and treatment of fragrance of lemons and 77.3 after. The pressure was more +3.5 different average than the before. most patients were improved their characters after this program (except C and E) as the result of character test. Therefore, following or this result of study, horticultural program with citrus fragrance of lemons that is helpful to concentration and anti-stress is effective for geriatric diseases especially stability of emotion.