|Conophytum plants in flower. Conophytum cubicum up front with white flowers, C. burgeri pink at left, C. irmae yellow at front right, etc. etc.|
|More Conophytum flowers at a University of Connecticut greenhouse, October 2016.|
A number of species, like Conophytum calculus (grey-green spheres at lower left in the second photo), have nocturnal flowers that open fully after dark and produce strong sweet and spicy fragrances. Nocturnal Conophytum flowers are frequently a pale, dull yellow or straw color, but white, pale pink and dark bronze also occur. Nocturnal Conophytum flowers will only open properly at night if it has been sunny during the day. On the night after a dark, cloudy day, they remain closed, in what could be an adaptation to prevent the flowers from getting ruined by rain.