Overwintering Garlic in High
         Tunnels
              Terrance T. Nennich
              Extension Professor
    Comm...
© 2009 Regents of the University of Minnesota
Purpose of the Research
              The Question??
• With winter temperatures reaching as low as –
  40 to – 50 F degree...
Research Strategy
• The variety Music Garlic would be planted
  both inside high tunnels and in outside plots.

• If that ...
Research Location

The location of the research was Bagley
 Minnesota, about 25 miles west of Bemidji.

Zone 2 – 3




   ...
• The garlic research project was conducted
  over a four year period

  – 2005, 2006 ( planted, harvested)
  – 2006, 2007...
Variety Selection.

• The variety Music was selected for the first
  three years of this study.

• For the fourth year a l...
Tunnel Design

• Two different high tunnel designs were used in
  this research project.

  – Gothic V roof design
  – Sma...
© 2009 Regents of the University of Minnesota
Planting Dates - Outside
The garlic was planted on the following dates
 outside of the tunnel
           The First Three y...
Planting Dates Inside the Tunnels


2005 October 20
2006 October 18
2007 October 22

Six inches of straw was applied 30 da...
Cold Temperature Data
 Days below 0 F                Coldest Day
  2005-06 17 days                        -37 F
  2006-07 ...
Snow Fall Data
• 2005-2006   Ample but below average

• 2006- 2007 Little snow cover

• 2007- 2008 Average snow cover




...
Survival Rate (%) Inside Tunnel
                  Gothic
• 2005 – 06   94%

• 2006-2007   92%

• 2007-2008   95%




     ...
Survival Rate (%) Inside Tunnel
                  Round

• 2005 – 2006        92%

• 2006 – 2007        87%

• 2007 – 2008...
Survival Rate Outside Tunnel

• 2005 – 06 69%

• 2006 – 07 2%

• 2007 – 08 79%



              © 2009 Regents of the Univ...
Harvest Data

• Average 3 year harvest was 21 -30 days
  earlier in high tunnels.




               © 2009 Regents of the...
Size Difference
• The size of the garlic grown in the high tunnels
  was about 30% more then outside.

  – Hard to statica...
Results
• The effect of extreme cold winter temperatures of
  the variety Music Garlic grown in high tunnels in
  zone 2 o...
2008-2009 Research

• In the fall of 2008, 15 different varieties, many
  soft neck were planted in the high tunnel for
  ...
Research Strategy
• 20 cloves from 15 different varieties were
  planted in a Gothic high tunnel on October 20,
  2008 to ...
Significant Weather Data


• In 2009 there were two nights that that
  temperatures dropped near or below
 -50 F




     ...
Garlic Varieties Used
•   Music
•   Russian Silverskin
•   Asian Tempest
•   Moroccan Silverskin
•   Blossem
•   Moroccan ...
Garlic Varieties
•   Creole Red
•   Inchellium Red
•   Silver White
•   Burgandy
•   Montana Giant
•   Spanish Red
•   Chi...
Results

• All varieties had over a 85% survival rate.

• The following slides picture the varieties




                 ...
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
© 2009 Regents of the University of Minnesota
Future Research


• Given this data, how will other perennial
  plants overwinter in high tunnels????




                ...
Questions


 © 2009 Regents of the University of Minnesota
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Overwintering Garlic in High Tunnels

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Presented by University of Minnesota Extension Professor Terry Nennich at the 2009 Minnesota Statewide High Tunnel Conference in Alexandria, MN on Dec. 2-3, 2009.

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Overwintering Garlic in High Tunnels

  1. 1. Overwintering Garlic in High Tunnels Terrance T. Nennich Extension Professor Commercial Fruit and Vegetable Production University of Minnesota Extension. nenni001@umn.edu © 2009 Regents of the University of Minnesota
  2. 2. © 2009 Regents of the University of Minnesota
  3. 3. Purpose of the Research The Question?? • With winter temperatures reaching as low as – 40 to – 50 F degrees in Zone 2 and 3 and the inside soil of high tunnels receiving no snow protection, would fall planted garlic inside high tunnels survive the winter and produce a good early crop of garlic the next spring? © 2009 Regents of the University of Minnesota
  4. 4. Research Strategy • The variety Music Garlic would be planted both inside high tunnels and in outside plots. • If that was successful we would they try less winter hardy varieties. © 2009 Regents of the University of Minnesota
  5. 5. Research Location The location of the research was Bagley Minnesota, about 25 miles west of Bemidji. Zone 2 – 3 © 2009 Regents of the University of Minnesota
  6. 6. • The garlic research project was conducted over a four year period – 2005, 2006 ( planted, harvested) – 2006, 2007 – 2007, 2008 – 2008 , 2009 © 2009 Regents of the University of Minnesota
  7. 7. Variety Selection. • The variety Music was selected for the first three years of this study. • For the fourth year a large selection of less winter hardy varieties were selected © 2009 Regents of the University of Minnesota
  8. 8. Tunnel Design • Two different high tunnel designs were used in this research project. – Gothic V roof design – Small round design. © 2009 Regents of the University of Minnesota
  9. 9. © 2009 Regents of the University of Minnesota
  10. 10. Planting Dates - Outside The garlic was planted on the following dates outside of the tunnel The First Three years 2005 September 21 2006 September 23 2007 September 19 Six inches of straw was applied following planting. © 2009 Regents of the University of Minnesota
  11. 11. Planting Dates Inside the Tunnels 2005 October 20 2006 October 18 2007 October 22 Six inches of straw was applied 30 day after planting © 2009 Regents of the University of Minnesota
  12. 12. Cold Temperature Data Days below 0 F Coldest Day 2005-06 17 days -37 F 2006-07 24 days -41 F 2007-08 33 days -38 F The 2006-2007 winter had 8 consecutive night -20F or colder. © 2009 Regents of the University of Minnesota
  13. 13. Snow Fall Data • 2005-2006 Ample but below average • 2006- 2007 Little snow cover • 2007- 2008 Average snow cover © 2009 Regents of the University of Minnesota
  14. 14. Survival Rate (%) Inside Tunnel Gothic • 2005 – 06 94% • 2006-2007 92% • 2007-2008 95% © 2009 Regents of the University of Minnesota
  15. 15. Survival Rate (%) Inside Tunnel Round • 2005 – 2006 92% • 2006 – 2007 87% • 2007 – 2008 94% © 2009 Regents of the University of Minnesota
  16. 16. Survival Rate Outside Tunnel • 2005 – 06 69% • 2006 – 07 2% • 2007 – 08 79% © 2009 Regents of the University of Minnesota
  17. 17. Harvest Data • Average 3 year harvest was 21 -30 days earlier in high tunnels. © 2009 Regents of the University of Minnesota
  18. 18. Size Difference • The size of the garlic grown in the high tunnels was about 30% more then outside. – Hard to statically compare because of different soils, fertility, rainfall, ect. © 2009 Regents of the University of Minnesota
  19. 19. Results • The effect of extreme cold winter temperatures of the variety Music Garlic grown in high tunnels in zone 2 or 3 has little effect on garlic winter survival. • The garlic grown in high tunnels had a much higher survival rate and increased size then the garlic grown outside. Drastic differences were noted in 2006 -07 when there was very little snow cover outside. © 2009 Regents of the University of Minnesota
  20. 20. 2008-2009 Research • In the fall of 2008, 15 different varieties, many soft neck were planted in the high tunnel for a winter survival study © 2009 Regents of the University of Minnesota
  21. 21. Research Strategy • 20 cloves from 15 different varieties were planted in a Gothic high tunnel on October 20, 2008 to be harvested spring 2009 • Cloves were covered with straw at a 6 inch depth. • Drip tape was placed in the high tunnel before planting © 2009 Regents of the University of Minnesota
  22. 22. Significant Weather Data • In 2009 there were two nights that that temperatures dropped near or below -50 F © 2009 Regents of the University of Minnesota
  23. 23. Garlic Varieties Used • Music • Russian Silverskin • Asian Tempest • Moroccan Silverskin • Blossem • Moroccan Hardneck • Chesnok Red • Japanese © 2009 Regents of the University of Minnesota
  24. 24. Garlic Varieties • Creole Red • Inchellium Red • Silver White • Burgandy • Montana Giant • Spanish Red • Chinese © 2009 Regents of the University of Minnesota
  25. 25. Results • All varieties had over a 85% survival rate. • The following slides picture the varieties © 2009 Regents of the University of Minnesota
  26. 26. © 2009 Regents of the University of Minnesota
  27. 27. © 2009 Regents of the University of Minnesota
  28. 28. © 2009 Regents of the University of Minnesota
  29. 29. © 2009 Regents of the University of Minnesota
  30. 30. © 2009 Regents of the University of Minnesota
  31. 31. © 2009 Regents of the University of Minnesota
  32. 32. © 2009 Regents of the University of Minnesota
  33. 33. © 2009 Regents of the University of Minnesota
  34. 34. © 2009 Regents of the University of Minnesota
  35. 35. © 2009 Regents of the University of Minnesota
  36. 36. © 2009 Regents of the University of Minnesota
  37. 37. © 2009 Regents of the University of Minnesota
  38. 38. © 2009 Regents of the University of Minnesota
  39. 39. Future Research • Given this data, how will other perennial plants overwinter in high tunnels???? © 2009 Regents of the University of Minnesota
  40. 40. Questions © 2009 Regents of the University of Minnesota
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