Re: HYB: freeze damage

Among irises here, there seems to be quite a range in sensitivity to sudden drops in temperature. Remember those seedling photos I posted last spring after the big freeze? All were in active growth at the time we were hit with the freeze, but damage ranged from death to relatively minor injury (they all looked pretty bad for awhile, but some were killed outright).
Sudden freezes here can kill unprotected mature clumps as well as seedlings but not do much damage to others that appear to be in the same active state of growth.
Maybe there are differences in growth activity that aren't apparent just by looking?
Most of this batch of seedlings that got frozen stiff were relatively uninjured - a little freeze dried here and there. But a few had their tops killed.
<If temperature drop is sudden, then they can't do that, and if in active growth can easily be damaged or killed.> 
--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>
Region 7, Kentucky-Tennessee <http://www.aisregion7.org>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

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