ND Grape and Wine Association

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    • About the NDGWA
    • Board Meetings
    • NDGWA Bylaws
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    • Contact
    • Connect with NDGWA
  • Industry
    • ND Grape and Wine industry In the news
    • Member Vineyards
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  • Resources
    • Petiole Testing
    • Business
    • Grape Growing
    • Winemaking
    • Other Resources
  • Competitions
    • 2023 Wine Competition
    • 2022 Wine Competition
    • 2020 Wine Competition
    • 2019 Wine Competition
    • 2017 NDGWA Competition
    • 2016 NDGWA Competition
    • 2015 Wine Competition Results
  • Events
    • 2023 Annual Meeting and Conference
    • 2022 Summer Tour

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 ~$32.00 each.

Latest News

  • KX Conversation: Grapes and Wine in North Dakota February 7, 2023
  • NDGWA Winter 2022/2023 Newsletter January 11, 2023
  • 2022 Bylaws update December 19, 2022
  • 2023 Annual Meeting and Conference December 15, 2022
  • Cottonwood Cider House November 18, 2022
  • Grape Growing in ND November 18, 2022

Membership

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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