Veraison

The onset of ripening. The change of color of the grape berries. Veraison represents the transition from berry growth to berry ripening, and many changes in berry development occur at veraison.

Tendril

Twisting, clinging, slender stem-like structure on vines. Tendrils attach themselves to a trellis or post to provide support for the plant. In grapes, tendrils are found opposite a cluster and leaves.

Sepal

Leaf-like parts on the outside of a flower. Usually green and just under the petals. Collectively called the calyx.

Parts of a flower.