Dormancy of corms in spring-flowering gladiolus (Gladiolus X Tubergenii Hort.) cv Charm was broken by ethanol vapor, acetaldehyde vapor, 100% CO_2, 1% C_2H_4, 1% CO, 100% N _2, 1% CaCN_2 or corm-immersion into water with or without high temeprature corm-storage at 30℃ for 15 or 30 days. The most accelerated flowering without adverse effect was observed in the 8 hr ethanol vapor treatment after 15 or 30 day storage at 30℃.