A petal is a conspicuous flower part and one of the elements of the corolla – the petals of a flower taken as a group, especially the conspicuously colored flower whorl. Petals may be free or fused with one another or with the members of other floral whorls.
Surrounded by sepals, flower petals are usually brightly colored and often secrete nectar and scent to attract the insects and birds necessary for cross-pollination. Once fertilization has taken place, the petals usually drop off. The petals of wind-pollinated flowers are often small and inconspicuous, allowing the stamens and stigma to be exposed for pollination.