This illustration is from Ronald Jackson's Wine Science: Principles and Applications, and shows the growth rate of various organs of ‘Colombar’ grapevines grown in South Africa throughout the season.1 One of the things that can be gleaned from this illustration is that it takes about 200 days from budbreak to harvest. This is a guideline.
From another one of my favorite online articles, Ed Hellman's Grapevine Structure and Function, I extracted this timeline and kept information about our varieties beginning with our very first very small harvest of Chenin Blanc in 2015. One thing that can be gleaned by keeping a log like that shown above is the number of days from budbreak to harvest. We now have six data points!
Varietal | Harvest | ||
Chenin Blanc | May 8, 2015 | September 22, 2015 | 137 |
Chenin Blanc | April 26, 2016 | September 26, 2016 | 156 |
Auxerrois | April 30, 2017 | September 21, 2017 | 144 |
Chenin Blanc | April 30, 2017 | October 7, 2017 | 160 |
Chardonnay | April 30, 2017 | September 23, 2017 | 146 |
References:
1. Jackson, Ronald S., Wine Science: Principles and Applications, Third Edition, Elsevier, Academic Press, 2008, pg. 109.
2. Ed Hellman, Grapevine Structure and Function.
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