Every year, grape vines go through an annual growth cycle that ultimately produces the ripe, juicy grapes needed for winemaking. June is a particularly exciting time at the vineyard because many of these steps occur in quick succession. We started June with some gorgeous budding grapes.
Wine grapes have high seasonal nutritional needs. As a result, when the buds first appear, we spray the grapes in the Walla Faces vineyard with a micromineral composition that helps them grow to their fullest potential. For example, spraying the buds with boron can help improve bud growth.
After the budding stage, the grapes will begin to flower. This is a a very-weather dependent step. During warm years, the grapes will flower early, whereas at cooler temperatures this step will be delayed. At our vineyard, we typically see flowering starting somewhere between the first and last weeks of June, depending on the weather. This year was pretty typical; flowering started a couple of weeks into the month.
Cabernet and Syrah grapes (as well as most Vitis vinifera grapes, the species used for winemaking) are self-pollinating. Sometimes wind and insects will help the process, but in general pollination is contained within the grape vine. Once the ovary is fertilized, the flower will begin to turn into a grape berry, surrounding a large seed.
Both the Syrah and the Cabernet Sauvignon grapes have stopped flowering now. They have entered the fruit set stage. These baby grapes will be the basis of the 2013 vintage.