This study investigated the flowering response of three Korean native Aster species, namely A. hayatae, A. spathulifolius, and A. koraiensis, to varying photoperiods. Three-month-old plants propagated from cuttings were grown under four different photoperiods: 9, 12, 14, and 16 h. Aster hayatae flowered under all conditions, with flowering rates of 92%, 85%, 65%, and 27% under 9-, 12-, 14-, and 16-h photoperiods, respectively. Flowering in A. hayatae was promoted by shorter photoperiods, classifying it as a facultative short-day plant. Aster spathulifolius flowered only under 9- and 12-h photoperiods, with no significant difference between these treatments, suggesting that the species is an obligate short-day plant. However, given the low A. spathulifolius flowering rates of 27% and 13% under 9- and 12-h photoperiods, respectively, further research is required. Aster koraiensis did not flower under any photoperiod, possibly due to vernalization requirements or juvenility. These findings offer valuable insights into the photoperiodic flowering responses of these three Korean native Aster species, enhancing our understanding of their ecological traits and potential horticultural applications.

Introduction
Materials and Methods
Results and Discussion
Acknowledgments
References

• Nam Hyun Im(Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul 08826, Korea)
• Dong Min Lee(Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul 08826, Korea)
• Hyo Beom Lee(Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul 08826, Korea, Research Institute of Agriculture and Life Science, Seoul National University, Seoul 08826, Korea)
• Myung Suk Ahn(Floricultural Research Division, National Institute of Horticultural and Herbal Science, Wanju 55365, Korea)
• Joonwoo Lee(Department of Smart Farm, Jeonbuk National University, Jeonju 54896, Korea) Corresponding author