Grape flowers, most of the flowers with bisexual flowers, is a self-pollinated crop, and its only very few varieties of female flower varieties, the need for heterogamous pollination. The flower of the grape by the pedicel, receptacle, calyx, corolla, stamens, pistil composition. The calyx of the grape is undeveloped, with five sepals united, surrounding the base of the flower. five green petals are united together from the top, forming a cap-like corolla. When the grape blossoms, the petals are separated from the base and the ovary, and roll upward and outward, and the cap falls off from above under the action of the stamens. This is a significantly different characteristic of grapes from other fruit trees. The pistil is located in the center of the flower, divided into stigma, style and ovary 3 parts, ovary 2 rooms, each room has 2 ovules. Each flower has 5 stamens, growing around the pistil, composed of filaments and anthers. There are 5 small nectaries at the base of the pistil, which contain aromatic phenolics.

Two, grape inflorescences

Grape inflorescences for the panicle, also known as the compound raceme, by the peduncle, the inflorescence axis, the lateral axis and buds. The peduncle, which is the future spike peduncle, extends upward to support the inflorescence. The central axis of the inflorescence is called the inflorescence axis, including the main axis and the axis of the branches at all levels, generally 2~3 levels of branches. Flower buds are borne at the top of the last branch. General wine grape varieties inflorescence short, depending on the variety, 1 inflorescence can bear 100 ~ 500 buds.

The grape inflorescence begins to occur in the new shoots in the same position as the tendrils, generally only born in the fruiting branches of the 3 ~ 8 nodes, but some varieties of higher nodes. 1 fruiting branches generally have 1 ~ 3 inflorescences, and sometimes there are 4 ~ 5 or more, there are differences between the different species or varieties. The nodes of the new shoots above the inflorescence bear only tendrils. The first inflorescence is larger at the base of the fruiting branch and smaller in the upper part. Eurasian varieties have 1 to 2 inflorescences per fruiting branch; American varieties have 3 to 4 or more per fruiting branch, but smaller inflorescences; European and American hybrid varieties have 2 to 3 on each fruiting branch. On 1 inflorescence, the buds in the center are well developed and mature early, the buds at the base are second, and the buds at the tip are poorly developed and mature the latest. Grape flowering period of 5~14 days, depending on the variety and climatic conditions.