Petunia parts are the components of a petunia flower. The two main parts are the sepals and the PETALS. The sepals are the green, leaf-like structures that form the outer layer of the flower bud. They protect the inner PETALS and provide support for the flower. The PETALS are the colorful, showy parts of the flower that attract pollinators. They are typically white, pink, or purple in color. Together, the sepals and PETALS make up the petunia flower.