Grape vines are pruned so that only a few primary buds develop per branch. The shoot begins to grow, usually in mid-March, and has to get big enough to reach flowering size. Blooming usually happens 50 to 80 days after the bud starts growing, usually sometime in May.

What is the growing season for grapes?

Grapes are planted in the late winter to early spring months. The plants start to grow in spring and continue to grow throughout the summer season. Grapes ripen in the late summer to early fall, depending on the variety grown.

Do vineyards blossom?

Grape flowers, or grape “flowering” in vineyard manager parlance, arrive in late spring, 40-80 days after bud break, depending on the temperatures and rain. ... It's during this stage of a grape's lifecycle that pollination and fertilization occurs, with the results ultimately producing a cluster.