Abstract
The effect of temperature and watering frequencies on seedling growth were investigated in Ornithogalum longibracteatum and Tulbaghia violacea. Temperature had a significant influence on seed germination with low (10 °C) and high (40 °C) temperatures resulting in poor germination in both species. The optimum temperature for seed germination of O. longibracteatum and T. violacea was 22.9 and 26.8 °C, respectively. Seedling survival rate for both species was higher at temperatures ranging from 10 to 25 °C. Bulb fresh weight of seedlings grown at 15–25 °C was significantly higher than for seedlings subjected to 30 and 35 °C. Leaf length increased with higher temperature. The highest number of roots was recorded at 25 °C in both species. Watering had a pronounced positive effect on the seedling survival percentage and seedling growth of O. longibracteatum and T. violacea. Watering three times a week (W3) resulted in rapid seedling growth compared to watering once or twice a week. These findings suggest that a combination of temperature (25 °C) and frequency of watering of the seedlings will result in better seedling quality for field planting.
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