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Old March 27, 2016   #75
bower
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Join Date: Feb 2012
Location: Newfoundland, Canada
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Very interesting. I've seen damage like this on some plants about the same age but newly transplanted into larger pots, when just a cold night followed by a daytime high only 10 C, so maybe 30 hours in that case.

But almost every year, we have about 80 hours in that temperature range - especially with days only close to 10 C and colder nights for three days in a row, usually in late may. I had a lot of varieties that tolerated the 80 hours or so with no damage. The difference, they were older plants. And they were already established in bigger containers, where the soil may have warmed already.

And of course, frost tolerance for a few hours is not the same thing as tolerating constantly low temperatures for three days or more. I think they are separate traits.
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