Flowering Control of Elsholtzia angustifolia (Loes.) Kitag., a Short-Day Plant

This study was conducted to investigate the photoperiodic flowering response of Elsholtzia angustifolia. Plants were grown under 9/15 h (day/night) (short day, SD), 16/8 (long LD), and night interruption (NI, 4 around midnight) conditions. Supplemental lighting with a light intensity µmol·m-2·s-1 applied for LD NI treatments. continuous SD conditions developed first floral bud at 5 weeks after sowing during seedling stage showed 100% 9 weeks. Under conditions, there no flowering, plants continued vegetative growth only. Early small number flowers. It not desirable marketable potted plant production, indicating that is need certain period before flowering. Among transfer performed 3 or 6 transplanting (WAT) manipulate time. The percent when transferred SDs. On average, approximately 36 days from WAT, significant difference between photoperiod inflorescences significantly increased as date delayed. leaves branches also by delayed date. These results indicate E. angustifolia an obligate non-forcing such NI, effectively inhibit early