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Growth and flowering responses of Hibiscus syriacus L. ´Blue Bird´, ´Shanchonyo´, ´Yongkwang´, and ´Honghwarang´ under various light qualities were investigated. During the experiments, photosynthetic photon flux (PPF) and temperature were maintained as similar level among the treatments. Light qualities of natural light were altered by cellulose films (red, green, and blue) and gelatin film (red C22, green C53, blue C65) in Experiment I and II, respectively. The ratio between different wavelengths(B: blue = 400-500 ㎚; GY: green + yellow = 500-600 ㎚; R: red = 600-700 ㎚; FR: far-red = 700-800 ㎚; T: total irradiance = 400-800 ㎚) were measured as photon flux density. High GY/T (green) increased plant height, whereas high B/T ratio (blue) decreased plant height, fresh weight, and dry weight. It also decreased leaf length, width, and area and produced dark green leaves. High R/T (red) increased total shoot length, but decreased chlorophyll a and total chlorophyll content. Flowering was accelerated by low P_(fr)/P_(tot). High R/T (red) decreased Hunter L value but increased Hunter a value, thereby FT value, which resulted in darker flower color.
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