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Characteristics of the pot-plant culture shown by different growing habits of Hibiscus syriacus were studied in relation to the effect of uniconazole and gibberellin (GA₃) treatments. Although tall cultivar ´Hwarang´ and ´Sintaeyang´ showed a reduction in shoot and internodal lengths with uniconazole and increase with GA₃, there was such reduction in the dwarf cultivars as ´Comte de Heimont´ and ´Wolsan´ with uniconazole, and no difference was noted with GAS. Leaf size for the two tall cultivars was reduced with uniconazole more than the control for without treatment and increased with GA₃. The two dwarf cultivars also showed reduction in leaf size, and no such difference was found with GA₃ treatment. No impressive difference was observed in both tall and dwarf cultivars about the number of flowers and flowering duration with either uniconazole or GA₃ treatment. Chlorophyll and total nitrogen contents of both tall and dwarf cultivars were increased with uniconazole, and decreased with GA₃ treatments. The two dwarf cultivars showed an increase in the contents with uniconazole, whereas GA₃ treatment did not show any difference in the contents. Sugar content of the tall cultivars increased with uniconazole, but GA₃ unlikely reduced it, while that of the dwarf cultivars only increased with uniconazole, and GA₃ did not show the difference. Starch content of both tall and dwarf cultivars decreased with uniconazole. Only GA₃ increased it for the tall cultivars, and that of dwarf cultivars was not influenced as much by GA₃. Peroxidase activity of both the tail and dwarf cultivars was increased with uniconazole treatment, and that of only the tall cultivars decreased with GA₃, while no such difference was noted for the dwarf. Catalase activity of both tall and dwarf cultivars was also increased with uniconazole, and was decreased with GA₃. This trend was more striking with the tall than the dwarf cultivars.
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