Veronica rotunda var. subintegra (Nakai) T. Yamaz. (mountain spike speedwell) and V. longifolia L. (long-leaf spike speedwell) are Korean native plants that have potential value as novel ornamental crops due to their unique appearance and flowering time. This study was conducted to examine the effects of cold and photoperiod treatments on the growth and flowering of two Veronica species. Eight-week-old seedlings with four or five nodes grown under a 9-h photoperiod were stored at 5 °C for 0, 3, 6, 9, or 12 weeks and then forced under one of six photoperiod conditions [9, 12, 14, 16, or 24 h of continuous light or 9 h with a 4-h night interruption (NI, 22:00 to 02:00 _HR)] in a greenhouse. Regardless of cold treatment, there were no significant differences among photoperiod treatments in any growth parameter (i.e., plant height, numbers of nodes or branches, leaf length or width, shoot or root dry weight) in either species. In plants without cold treatment, V. rotunda var. subintegra showed more than 85.7% flowering regardless of photoperiod, and flowering of V. longifolia was 80.0, 66.7, 70.0, 85.7, 71.4, or 100.0% under photoperiods of 9, 12, 14, 16, or 24 h or NI, respectively. The number of nodes below the first inflorescence, the number of visible inflorescences (VI) at the first open flower, and days to VI were not influenced by photoperiod in either species. As a result, cold treatment was not necessarily required for the flowering of the two Veronica species. Moreover, photoperiod also did not affect the flowering of either species. These results indicate that the two Korean native Veronica species can be classified as day-neutral plants with no vernalization requirement.

维罗妮卡圆形大厅变种。subintegra (Nakai) T. Yamaz。(mountain spin speedwell) 和V. longifolia L. (long-leaf spice speedwell) 是韩国本土植物，因其独特的外观和开花时间而具有作为新型观赏作物的潜在价值。本研究旨在检验冷处理和光周期处理对两种Veronica物种的生长和开花的影响。在 9 小时光周期下生长的具有 4 个或 5 个节点的 8 周龄幼苗在 5°C 下储存 0、3、6、9 或 12 周，然后在六种光周期条件之一下强制进行 [9, 12, 14、16 或 24 小时连续光照或 9 小时夜间中断 4 小时（NI，22:00 至 02:00 _HR)] 在温室中。无论冷处理如何，在任何一个物种的任何生长参数（即植物高度、节或分枝数、叶长或宽度、枝条或根干重）方面，光周期处理之间没有显着差异。在未经冷处理的植物中，V. rotunda var. 无论光周期如何，subintegra 都显示超过 85.7% 的开花，而V. longifolia 的开花在 9、12、14、16 或 24 小时或 NI 的光周期下，分别为 80.0、66.7、70.0、85.7、71.4 或 100.0%。第一个花序下方的节数、第一朵开放花时可见的花序 (VI) 数和到 VI 的天数都不受光周期的影响。因此，这两种Veronica物种的开花不一定需要冷处理。此外，光周期也不影响任一物种的开花。这些结果表明，这两种韩国本土Veronica物种可以归类为没有春化要求的日间中性植物。