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This study was conducted to investigate the cold hardiness of 58 different cultivars of Hibiscus syriacus, the reliability and convenience of 4 viability tests for cold hardiness evaluations of Hibiscus syrlacus. ´Hwahong´, ´Kaeryang-chajoo´, ´Kreider Blue´, ´Nabora´, ´Sol-tanshim´, and ´Kyop-chajoo´ were relatively hardy, whereas ´Sir de Charles Breton´, ´Sujubo´, ´Wolhak´, ´Hanboram´, ´Pompon´, and ´Lucy´ were tender. Cutting and growth were the most reliable test, while they required considerable time to be qualitative. Evaluation of visible tissue injuries using browning as the criterion and TTC reduction were not certain and satisfactory for Hibiscus syriacus. Specific conductivity was proved to be a simple and reliable means for determination of the viability of Hibiscus syriacus.
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