Versicolor, ensata & such

Since I live in the Buffalo, NY area, cold has never been a problem (lack of,
that is), however, I have a friend who is interested in some of the Huber
irises and who has asked me whether they NEED a cold period.

So - I throw this question to the robin - do they 'need' cold, and if so -
what degree and length (by degree, I don't mean TEMPERATURE, I mean level).

Kathyguest - East Aurora, NY... whose backyard after a few frosts resembles
the vegetable bin of her refrigerator where I forgot about that boston
lettuce
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