Annual Growth Cycle of the Grapevine
As the new primary shoot develops, flower clusters form opposite a leaf (See Figure 1.2). Where a flower cluster does not develop, a tendril may grow opposite the leaf. A fruitful shoot usually produces one to three flower clusters (inflorescences) depending on the variety and growing conditions of the previous season under which the dormant bud (that produced the primary shoot) developed. Many grape species, including most varieties of Vitis vinifera, form only two flower clusters per shoot. French- American hybrids as a group tend to flower prolifically with four or more clusters per shoot. Location of these clusters on the shoot also is specific.
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