Re: Bearded iris in hot/humid US (Z8b and warmer)

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Part of the biological needs for iris is a winter, for vernalization.

"Mediterranean climate, major climate type of the KÃppen classification
characterized by hot, dry summers and cool, wet winters and located
between about 30Â and 45Â latitude north and south of the Equator and
on the western sides of the continents. In the KÃppen-Geiger-Pohl
system, it is divided into the Csa and Csb subtypes"

Warm climates without cool enough winters will not be able to trigger
vernalization needs, and short circuit biological signals.

Chuck Chapman

-----Original Message-----
From: Kenneth Walker k*@astound.net [iris-species]
<i*@yahoogroups.com>
To: iris-species <i*@yahoogroups.com>
Sent: Thu, Nov 13, 2014 9:14 pm
Subject: Re: [iris-species] Bearded iris in hot/humid US (Z8b and
warmer)

Â
Many bearded iris will grow in zone 9, if it is a
Mediterranean climate. I beleive the problem is the combination of
summer heat with humidity that does them in.

Ken Walker
Concord, CA USA
Zone 9

On 11/13/2014 3:46 PM, Sean Zera z*@umich.edu [iris-species]
wrote:

 I don't know if it's in cultivation
in the US, but it seems to me that Iris siculaÂcould be
useful for breeding heat-tolerant TBs. It's a tetraploid
native to Sicily, Malta and Gozo in the Mediterranean. I
assume some of the old diploids are heat tolerant when
they're closer to wild pallidaÂthen to variegata.

Sean Z
Zone 6a
SE Michigan, where winter really kicked in today


On Thu, Nov 13, 2014 at 4:17 PM, Shaub
Dunkley s*@bellsouth.net [iris-species]
<i*@yahoogroups.com> wrote:
Â


In his note to Jack Finney, Mark Cook made
comment about being too far
south (z8b) to grow most kinds of irises.
I'm very interested in the
matter of bearded iris in the Deep South US
(or hot/humid climates
anywhere). My interest is broader than the
species level but discussion
here at that level would be great. I
speculate there is room for more
optimism that a number of bearded irises
can be grown reasonably well in
z8b and some even marching into z9. A 1942
study at TX A&M found 149
cultivars out of 582 well adapted to
College Station, TX. Z8b now, not
sure what it was back then. Temptation,
there are cultivars included
that are species equivalents, e.g
'Nudicaulis' which equates to Iris
nudicaulis (Hooker 1869). And Jack, nice
performances by old diploid TBs
there.

One place to view article: (remove spaces)
http: //

catalog.hathitrust.org/api/volumes/oclc/10651980.
html

If you subscribe to the iris-talk listserve
and and want to chime in see
the "CULT: Growing Iris South Florida"
thread. If you happen to be a
HIPS member, my main stomping grounds, I
have a thread going on there
too. Or I'd also be delighted to discuss by
direct email: phloid at
bellsouth dot net

I personally want to hear more irises
talking for themselves. We need
field data and trials work.

Thanks,
Shaub Dunkley
Z6b near Asheville NC

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