For this cultivar optimum temperature was 20◦C, at which over 80% germination was achieved, suggesting that calendula is adapted to germination during cool seasons.Lower levels of germination (52–76%) occurred at 15 and 25◦C,and only scant germination (11–28%) occurred at the higher temperatures of 30 and 35◦C. Seedling elongation and dry weight gain of this same cultivar were highest at 20◦C, in both light and dark conditions, whereas both variables were nil at 30 and 35◦C