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Brian Talley, Vintner
 
August 23, 2013 | Brian Talley, Vintner

Grape Sampling

As harvest approaches, one of the most critical tasks to determine wine quality is grape sampling. Sampling guides our harvest schedule because we measure the sugar and acid content of the grapes, which are key indicators of ripeness. At the same time, we also refine our crop estimates because we weigh the clusters we sample.

I shot a short video featuring Harvest Intern Ben Taylor and Winemaker Eric Johnson that illustrates the entire process. For those who prefer to read rather than watch, here’s a brief synopsis: Eric and Vineyard Manager Travis Monk determine which vineyard blocks to sample. Ben walks through each block, randomly gathering about 25 clusters, brings them back to the winery, weighs then crushes them with a small hand crusher. The juice is analyzed for brix (sugar content), and pH (a measure of acidity). This information, along with cluster weights is recorded and emailed to me, Eric and Travis. We use this information to determine which blocks to visit and taste, which is the final determinant of the harvest schedule.

This is the actual grape maturity sheet we look at every day from samples we pulled on August 20 from the West Rincon Vineyard. We will likely harvest this block in 2-3 weeks.

Date

Vineyard

Block

Varietal

Brix

pH

lbs/cluster

Comments

8/20/2013

WR

1101

PN

20.7

2.94

0.166

cluster

8/20/2013

WR

1102

PN

20.9

2.91

0.095

cluster

8/20/2013

WR

1103

PN

21.3

2.91

0.129

cluster

8/20/2013

WR

1104

PN

20

2.89

0.133

cluster

8/20/2013

WR

1105

PN

21.1

2.93

0.146

cluster

8/20/2013

WR

1106

PN

20.7

2.91

0.139

cluster

8/20/2013

WR

1107

PN

21

2.97

0.116

cluster

Based on what we learned today, we think harvest will start sometime next week, in Rosemary’s Vineyard Block 8, a tiny high density block that we farm by hand, and that often makes it into the Rosemary’s Vineyard Pinot Noir bottling. We’ve had perfect ripening weather for the last 8 weeks and we’ve got a beautiful crop. I have high hopes for the 2013 harvest!

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