Month: July 2012

 

July 18th, 2012

Veraison is Here

by: Dan Cederquist


We made it to veraison this weekend for our chardonnay and tempranillo. This photo was taken Friday afternoon in the tempranillo in D block.
I thought I would explain “veraison” for this blog post.

Veraison is the division of the two distinct phases of grape growth. In the first phase, cell division and expansion occur. The berries contain all the natural acids (tartaric, malic, citric,…etc) by the end of this phase. Tartaric is produced early on and malic at the end of phase 1. In the second phase, sugars start accumulating and malic acid starts degrading. Cell divisions stops, cell growth accelerates, berries soften and color up. Canes harden off or lignify, and we see some leaf senescence lower on the cane. Chlorophyll is broken down while anthocyanins (black grapes) and carotenoids (green grapes) are formed. Also, pyrazines (herbaceous characters) are degraded and fruity flavors accumulated and/or enhanced.

Whew!, too much chemistry for most people but that is the story. All in all, our vineyards look terrific, only 2 more blocks to hedge and mow and maybe a little color thinning if needed.

Until next time…

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