Hi,
It is my understanding that it is not the freezing that kills potted culture, it is freezing and thawing, over and over in Autumn and Spring that kills the roots. As long as it freezes and stays frozen you are OK.
I just checked my potted currants in the garage 2 days ago and they were dormant. Today I see the buds have pushed and starting to show green. Aaaarrrggh. Another spring like last year.
Possibly should block the single window.
Later,
Tom
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