Flowering. As bud break turns into vegetative growth, the next process of the grape vine begins from April to May. Flowering is when bunches of tiny flowers bloom from the new vine shoots. Grape vines are self-pollinating, so each of these flowers has the potential to turn into a single berry.

Is a grape vine a flowering plant?

Grapevines bear greenish flower clusters, so small that they are hardly noticeable. The flowers are produced at the beginning of the growing season, which is usually sometime in May. Bloom time varies with local climate and the grape variety.

How do you get a grape vine to flower?

Grapevines require full sun to activate the flower blossoms. Without sufficient sunlight, the flower buds won't develop properly. In addition, pruning the vines incorrectly may affect the blossoms. Most wine grapes are pruned severely in the winter, leaving only short spurs on the woody trunk and main branches.