[NAFEX] Hardiness Additional info

Dean Kreutzer deankreutzer at hotmail.com
Tue Oct 19 11:49:34 EDT 2004

One additional thing that is important to note is the duration that the 
plant is exposed to extreme temperatures.  A sustained exposure to -40F 
temps for a day would probably do more damage than an hour at -45F temps.  
At the University of Saskatchewan last year they had -49F for 1 hour, and 
some of their cherries escaped with no damage.  Lon has also mentioned that 
there are some Montana vitis riparia grapes that have survived -70F temps.  
I have to be honest, after supercooling fails at -40F I don't know what 
process allows plants to survive these extremes.

Dean Kreutzer
Regina, Saskatchewan Canada
USDA zone 3

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