The flowering period of a vine extends from mid-May to the end of June. 45-90 days have passed since the budding, so that the flower spikes are thriving on numerous shoots. In a good year, about 60 percent of the flowers develop into the longed-for grapes. If, on the other hand, the dreaded drainage occurs, the rate is far lower. The fertility disorder can be attributed to the following causes:
Unfavorable climatic conditions can cause the vine to lose flowers
- constant low temperatures below 15 degrees Celsius
- prolonged heat of more than 30 degrees Celsius
- a rainy weather
- incorrectly dosed fertiliser
- improper pruning
- Finishing on an unsuitable substrate
If it comes to trickling, numerous flowers are thrown off the vine. Accordingly, fewer berries can develop, which significantly reduces the harvest yield. Various grape varieties have proven to be particularly susceptible, such as Merlit, Malbec or the popular Gewürztraminer. By choosing resistant finishing underlays, there is the possibility of a preventive influence.