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Re: Summer bloom

I suspect that the  info on MDB was  more speculation then proven fact.

The info on IMM just sitting ther when night temp was above 70 would make sense if the fans were mature, that is 10-11 mature leaves. The temp being above a certain temperature and below a certain temperature would fit with plant needs re setting flower stalks .

Have you had night temps below 70F in past few weeks? Details if you have them.

Chuck Chapman

Date: Sun, 31 Aug 2008 10:30:35 -0400
From: Linda Mann <lmann@lock-net.com>
Subject: [iris] Re: Summer bloom

Chuck, that temperature doesn't seem to fit my casual observations of
IMMORTALITY.  Maybe there are still some other things going on with IMM
& growth at temperatures lower than 102oF.

I don't have records, but the impression I've gotten over the years is
that IMM shuts down when daytime temperatures are in the upper 90s, or
at least when nighttime temperatures are above 70oF, regardless of
available moisture. Or maybe it doesn't shut down completely, but slows
to such a crawl that senescence keeps up with new growth?

I remember some discussion in this forum during the last century ;-),
about MDBs respiring more C than they are able to fix because of warm
night time temperatures.  Maybe some cultivars have some of those same
genes?  If rebloom genes come from dwarf species...

<And max temp in day to not be above the critical (for cultivar) of heat
dormancy, of about 102F .>
- --
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>

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