However, photosynthesis in sepals occurs at a slower rate than in ordinary leaves due to sepals having a lower stomatal density which limits the spaces for gas exchange.

After flowering, most plants have no more use for the calyx, which withers or becomes vestigial, although in a few plants such as Lodoicea and Solanum melongena (aubergine, brinjal) the calyx grows along with the fruit, possibly to protect the attachment point.