Re: iris DIGEST V1 #953

Chuck, Just so I understand what I'm supposed to understand--

It's my understanding that bloom is set after spring bloom,  then stalks are
"initiated" later, when the conditions are right?  Whatever the process that
causes "initiation" would depend on temperature and/or other conditions like
soil composition & moisture?  Soil composition & moisture being two key
components in rhizome growth?


<<hot at nifght to get flower bud
et temperature,>>

Do you have an estimation on the average time elapse between "initiation" and
open bloom?  It would vary depending on temperatures?  Just as spring stalks
do?

My goal is to heavily incorporate irises that bloom here in the summer in
hopes of creating more irises that bloom well in advance of our fall frosts.
I've already incorporated a number of "sporadic" rebloomers.  I am getting
things that rebloom, sometimes in the first generation.  It's always a thrill.

Betty Wilkerson
Bridge In Time Irises
KY Zone 6


-----Original Message-----
From: irischapman@aim.com
To: iris@hort.net
Sent: Mon, Nov 9, 2009 1:32 pm
Subject: Re: [iris] iris DIGEST V1 #953



The oncers with increases blooming in spring obviously had large increases
oing into
all and got vernalized, so bloomed at maturity. Too large and advanced to be
eset
y apical dominance.
The Immortality blooming a month after spring bloom is likely blooming on
ncreases
that were a good size already in spring.  In your crowded clumps ther will be
any fans
f various size.
As per reply to Betty. Get your weather records and check temperatures.
hile a lot of time in summer it would be too hot at nifght to get flower bud
et temperature,
it could very well occur before onset of hot weather.
Chuck Chapman


Date: Sun, 08 Nov 2009 14:12:56 -0500
rom: Linda Mann <lmann@lock-net.com>
ubject: [iris] Re: REB: cycle vs other
Betty's comments seem to apply here as well - a cultivar may be
ncreasing a lot, yet not put up any stalks at all until some unknown
to me) combination of fertility, temperature scenario, pH, aeration of
oots?, you name it, come together to suit.
I'm always surprised to hear QUEEN DOROTHY described as such a reliable
ebloomer, summer included.  It was so unhappy here, I finally got rid
f the few scraps remaining.  But I'm pretty sure it does well for
thers in this general area (places where borers thrive <g>)
Chuck, what do you make of "oncers" that produce more than one stalk on
other rhizomes during spring bloom?  One in the terminal fan, usually
nly a few days ahead of one or more on side fans?  Do you think these
re genetically cycle rebloomers where the terminal didn't get a chance
o bloom the preceeding fall/winter?  That makes some sense to me -
ften the terminal stalk will have more late freeze damage than the
ateral ones.  Or are they basically "winter" bloomers?  Or is that what
ate cycle bloomers are in general?  Do they bloom off and on all winter
n mild winter climates?
Betty said:
This agrees with my observations.  I do believe the sporadic and
whenever" could be the same with variations in strength and/or
odifiers.  Sporadics freely bloom in warmer zones, occasionally, but
arely, blooming for me (and others) in zone 6.  The stronger
whenevers" are much more likely to bloom here, sometimes in July and
ugust.  A problem I see with Immortality and a few others, here in my
arden, is a very poor stalk to fan ratio.  Rapid increase does not
lways equate good rebloom, here.  Or even good spring bloom.
pparently, there are many variables that trigger rebloom on the
whenevers."  >
Chuck said:
At times it takes close observation to distinguish what type of
ebloomer you have. A plant that reblooms later in season may be a
ummer rebloomer genetically, but not have had size earlier in season to
rigger bloom. So you would need to have noted that it was at size (leaf
aturity) to have summer rebloom, and have it sit there and not rebloom
hen opportunity presents. Opportunity based on weather factors, but you
an use plant markers such as Immortality and Queen dorothy as markers.
Also you can have Fall cyclic rebloomers put up a summer bloom, but on a
an that should have bloomed in spring, but was just missing all factors
eeded. You can tell this by checking rhizome to see if it is a mother
an blooming or an increase. If on a mother fan, then consider this to
ot be a summer rebloomer, until you get a summer bloom on an increase.
There is absolutly no doubt in my mind that Summer Rebloomers and Fall
yclic rebloomers are different genetically. I had made numerous crosses
f Forever Blue with summer rebloomers, nary a rebloom seedling out of
undreds of seedlings.  Many rebloomers out of FB X fall cyclic
ebloomers.  Far far past any level of significance you could apply to this.
Many instances of Fall cyclic rebloomers from cross of  Fall cyclic
ebloomers X oncers. George Sutton had written and article on this a
ouple of years back.
Chuck Chapman>
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