Section in the annual growth cycle the grapevine after blossom (see also under BBCH Code ). The fertilized female ovaries of the flowers develop into berries. This occurs in the northern hemisphere in the months of June to July, in the southern from December to January. The amount of berries is among others of the vine dependent. As a rule, about one third (eg in Chasselas and Riesling) is fertilized up to a maximum of two thirds (eg in Silvaner) of the single flowers. One berry contains up to five (rarely six) grape seeds, which are used as seeds for the breeding new varieties can be used by sowing and selection.
Due to unfavorable environmental conditions such as frost (Late frost), diseases and pests or infections virus it can come to a bad fruit approach. Then the unfertilized or insufficiently self-fertilized ovules no longer mature into seed pits. The unfertilized flowers Verrieseln (French: Coulure), meaning they simply fall off after flowering or wither away to small, seedless, seedless berries ( millerandage, french Millerandage).
In berry development phase I (cell division phase), the first phase of berry thickness growth takes place. Depending on the variety and vintage, it extends over a period of 5 to 6 weeks. The condition of the fully grown berries covering the stem but still hard and sour berries is called closing of grapes (Picture right). In the berry development phase II (suspension phase = standstill), there is a purely external growth stop. In this phase, the construction or dismantling of the acids to a certain value. The duration is with some days to three or Riesling even four weeks very strongly depending on the variety. The next development step after these two phases is the berry development phase III; see below veraison (Maturity onset). A list of varietal specific keywords is under grapevine contain.