Re: HYB: long chill requirements?

 

Someone with better knowledge feel free to correct me, but I think they just don't germinate quickly at refrigerator temperature. Once their cold dormancy has been satisfied, plenty of species will germinate immediately upon being removed from the fridge, and they need the warmer temps to make them believe it's spring. Off the top of my head I want to say that tall bearded seeds germinate when the soil temperature reaches the mid-50's F?

Of the species in the ancestry of tall beardeds, the one with the longest, coldest winters in its native habitat would presumably be variegata from central Europe.

Sean Z
Zone 6a
SE Michigan

On Tue, Jan 13, 2015 at 3:22 PM, Linda Mann l*@lock-net.com [iris-species] <i*@yahoogroups.com> wrote:
Â

Just wondering if any of you know which bearded iris species evolved in
a climate with half a year of temperatures between 32 and 45oF.

A lot of the tall bearded irises I'm working with (mostly Immortality,
Matrix, Renown, Harvest of Memories) seem to take 4 months or longer in
the fridge before they <start> to germinate and another couple of months
or so to finish.

High elevation near the tropics?

Linda Mann
east TN USA zone 7


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