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Grapevine flowering arrives in late spring, two months or so after bud break. Grapevine flowers are not the most dramatic or beautiful, but they do have a wonderful fragrance. Grape flowers need average daily temperatures between 59-68 degrees Fahrenheit, and it is during this stage of a grape’s lifecycle that pollination and fertilization occur. For fertilization to occur, grape flowers do not need bees for pollination. Grapevines have what is called a perfect flower, meaning they are self-pollinating flowers.
There is a window when the flowrs are in full bloom. It is at this point that they are extremely vulnerable. Any adverse climatic condition can mean losing the potential crop. Rain, wind or cold tempratures can result in shatter. The term shatter means the cluster grows without the idea tight shape, resulting in grape berries differing in size or even missing all together. While this variation does not affect the quality of the grapes, it definitely affect their quantity.
Fruit set follows bloom immediately. Fruit set is defined as the time when fertilized flowers develop into a grape. Once the fruit set is done, we start to get a good idea of our crop for the season. Right now, we are looking good.