Overwintering Garlic in High Tunnels
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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.

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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  • 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. © 2009 Regents of the University of Minnesota
  • 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. 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. 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. • 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. 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. 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. © 2009 Regents of the University of Minnesota
  • 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. 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. 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. 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. Survival Rate (%) Inside Tunnel Gothic • 2005 – 06 94% • 2006-2007 92% • 2007-2008 95% © 2009 Regents of the University of Minnesota
  • 15. Survival Rate (%) Inside Tunnel Round • 2005 – 2006 92% • 2006 – 2007 87% • 2007 – 2008 94% © 2009 Regents of the University of Minnesota
  • 16. Survival Rate Outside Tunnel • 2005 – 06 69% • 2006 – 07 2% • 2007 – 08 79% © 2009 Regents of the University of Minnesota
  • 17. Harvest Data • Average 3 year harvest was 21 -30 days earlier in high tunnels. © 2009 Regents of the University of Minnesota
  • 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. 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. 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. 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. 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. Garlic Varieties Used • Music • Russian Silverskin • Asian Tempest • Moroccan Silverskin • Blossem • Moroccan Hardneck • Chesnok Red • Japanese © 2009 Regents of the University of Minnesota
  • 24. Garlic Varieties • Creole Red • Inchellium Red • Silver White • Burgandy • Montana Giant • Spanish Red • Chinese © 2009 Regents of the University of Minnesota
  • 25. Results • All varieties had over a 85% survival rate. • The following slides picture the varieties © 2009 Regents of the University of Minnesota
  • 26. © 2009 Regents of the University of Minnesota
  • 27. © 2009 Regents of the University of Minnesota
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  • 29. © 2009 Regents of the University of Minnesota
  • 30. © 2009 Regents of the University of Minnesota
  • 31. © 2009 Regents of the University of Minnesota
  • 32. © 2009 Regents of the University of Minnesota
  • 33. © 2009 Regents of the University of Minnesota
  • 34. © 2009 Regents of the University of Minnesota
  • 35. © 2009 Regents of the University of Minnesota
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  • 37. © 2009 Regents of the University of Minnesota
  • 38. © 2009 Regents of the University of Minnesota
  • 39. Future Research • Given this data, how will other perennial plants overwinter in high tunnels???? © 2009 Regents of the University of Minnesota
  • 40. Questions © 2009 Regents of the University of Minnesota