ND Grape and Wine Association

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Petiole Testing

As a benefit of membership, NDGWA members will receive three petiole tests for free.

The best time of the year to check the nutritional status of our vines is when the grapes begin to flower. Veraison is the other time. Bloom time sampling can be used to make in-season fertility adjustments, while sampling at veraison is used to evaluate one’s overall fertility program.

Collect only one petiole per shoot.  Each sample should consist of 100 petioles so the lab has sufficient material to test.  For bloom time sampling, take the petiole closest to the cluster.  At veraison, take the petiole of the last fully expanded leaf.  Wrap the samples in a dry paper towel (NOT PLASTIC) and mail to:

AgVise Laboratories
PO Box 510
Northwood, ND  58267

Include a note with your name, the grape variety, sampling date, and a request for a “complete tissue analysis including total nitrogen”.

How to collect petiole samples: Information from Univeristy of Minnesota 

YouTube video on petiole sampling:

The cost for petiole testing is ~$40 each. Members will be reimbursed for up to three petiole tests provided you supply the organization with the results of your test. Submit your request for reimbursement (copy of receipt) and test results to: NDGWA, c/0 Greg Cook, Treasurer, 1338 10th St S, Fargo, ND 58103.

Latest News

  • NDGWA Mobile App June 26, 2020
  • 2019 NDSU Trial Grape Results December 24, 2019
  • 2019 Conference – in the bag February 4, 2019
  • Cottonwood Cider House Rules August 9, 2018
  • Dakota Sun Shines at the 2018 Indy International Wine Competition June 22, 2018
  • Growing Grapes in North Dakota May 31, 2018

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If you are interested in membership in the North Dakota Grape and Wine Association, you can find more information on our membership page.

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