Re: REB: Genetics of rebloom
iris@hort.net
  • Subject: Re: REB: Genetics of rebloom
  • From: C* C* <i*@aim.com>
  • Date: Mon, 21 Mar 2011 11:58:07 -0400

 Yes thanks. Still lots of information to sort out.

Extra light will keep plants growing, and more growth means more advanced
growth etc. I would expect milder temperature in down town as versus weather
station, so perhaps no frosts?

I have seen reports previously of extra light conditions keeping iris plants
blooming in Dec and Jan in californai

What is the coldest? temperature that you get?? How much freeze out death of?
late flower stalk? do you get?





---- Original Message ----
From: Michael Sutton &lt;info@suttoniris.com&gt;
To: iris@hort.net
Sent: Mon, Mar 21, 2011 11:01 am
Subject: Re: [iris] Re: REB: Genetics of rebloom

   just a small note, we are five miles west of porterville in the country and
get much colder with many more days of sub freezing weather than in the town
itself.  The city of Porterville's official flower is the iris and we have
supplied them with thousands of rebloomers.  the downtown area has bloom
year-round and their spring peak bloom is nearly a month ahead of ours.
Interestingly the iris in planters under the street lights bloom more
profusely year round if they are rebloomers and have an even earlier peak
spring bloom. (bout a week earlier) checked to see if it was a heat issue  but
there is no difference in the ground level temps under the street lights  as
opposed to the iris not planted near the lights, so it is more than  likely a
light issue.  The first freeze at our gardens is typically mid to  late Oct.
with the last freeze in late Feburary - early March (but of course  we have
had frosts through April in the past).  We usually experience our  first tall
bearded rebloom in early June, about six weeks after peak spring  bloom.
Spring peak has been getting latter for the past decade, up to about  the 22 -
25th of April.  When we first moved the gardens here in 1988, peak  was tax
day (April 15th).  This year looks like an extremely late bloom  year.  Don't
know if that helps your research but thought it might be useful
information.?
 Mike Sutton?
?
 ----- Original Message -----  From: "Chuck Chapman"
&lt;irischapman@aim.com&gt;?
 To: &lt;iris@hort.net&gt;?
 Sent: Monday, March 21, 2011 5:14 AM?
 Subject: Re: [iris] Re: REB: Genetics of rebloom?
?
  &gt; In terms of the rebloom trigger, the California Rebloomers (CR) has
the?
 &gt; latest season trigger. Much later then Fall Cyclic. So much work is
needed  &gt; to??
 &gt; bring this into play? earlier in season. So carefull selection is
needed?  &gt; in?
 &gt; order to select? the ones with less then 4-5 months of growing season,
&gt; after?
 &gt; bud initiation.?
 &gt;?
 &gt; The second selection process is? select those that can carry a flower?
 &gt; initiation over winter undamaged, so they can have extra early and  &gt;
extended?
 &gt; bloom in spring. This works well in Ca and Oz, but may not work as well
in?
 &gt; areas that get colder winters.?
 &gt;?
 &gt; The third factor is in having a moderate growing season, so flower buds
&gt; can be?
 &gt; initiated early and often, and plants can continue to grow, not be in
&gt; climate?
 &gt; induced drought and heat dormancy.?
 &gt;?
 &gt; I checked weather in Portervile Ca. In 2010? there were only 5 days?
of?
 &gt; freezing weather, (30F)? and? June, July, Aug, Sept and Oct all had? bud
&gt; set?
 &gt; temperatures.?
 &gt;?
 &gt; In OZ, Barry Blyth reports 80-90% of all cultivars have rebloom.?
 &gt;?
 &gt; When we compared super hardy plants from your climate and my climate, we
&gt; found?
 &gt; the same plants were in both of our super hardy group, were we grew the
&gt; same?
 &gt; plants.?
 &gt;?
 &gt; When you have a super growing environment, and plants have adequate
water,?
 &gt; then I suspect? that you can have such fast growth of increases? that
they  &gt; can?
 &gt; bypass the reset signal from main fan. When you don't have thes  &gt;
conditions,?
 &gt; you don't get this phenomenon.?
 &gt;?
 &gt; Combining the differernt rebloom genes in the same plant doesn't?
produce  &gt; any?
 &gt; increase in rebloom. Still only one flowering per fan. Earliest trigger
is?
 &gt; what starts the flower initiation.?
 &gt;?
 &gt; For? extended season bloom, we need early rebloom trigger and fast
growth  &gt; and?
 &gt; multiple increases.?
 &gt;?
 &gt; Chuck Chapman?
 &gt;?
 &gt;?
 &gt;?
 &gt;?
 &gt;?
 &gt; ---- Original Message ----?
 &gt; From: Linda Mann &lt;lmann@lock-net.com&gt;?
 &gt; To: iris@hort.net?
 &gt; Sent: Sun, Mar 20, 2011 9:52 pm?
 &gt; Subject: [iris] Re: REB: Genetics of rebloom?
 &gt;?
 &gt;   Time will tell.??
 &gt; ??
 &gt; You are in so much colder climate than here, I can see you wouldn't see
&gt; much?
 &gt; good coming from CA/OZ selections, rebloom or not.  CA/OZ are both
close  &gt; to?
 &gt; my climate temperature zone, so weakness here is more from  intolerance
to?
 &gt; erratic rain, high humidity, and some years, severely  erratic winter.
&gt; But?
 &gt; like selections in any climate, there are some with  more potential
than?
 &gt; others.  Figuring out which ones will work here the  big challenge.??
 &gt; ??
 &gt; & if CA/Oz summer rebloom requires a long growing season, that's a
good?
 &gt; thing here.  & if you are right that it is one or more dominant
traits,?
 &gt; that's even better.??
 &gt; ??
 &gt; But I can see that's not going to work for you.??
 &gt; ??
 &gt; I hope I can get some plants to cooperate this year to try a few more
IMM  &gt; X?
 &gt; (IMM x XYZ) mixes. XYZ being west coast or Oz selections.??
 &gt; ??
 &gt; Chuck Chapman in Canada said:??
 &gt; &lt;I don't see Cal rebloomers adding anything to mix that a good (cold
&gt; or??
 &gt; otherwise)??
 &gt; hardy plant with branching? and bud count PLUS? hardiness couldn't add
to??
 &gt; mix.??
 &gt; Without bringing in the? weakness a number of these California plants
&gt; have.?
 &gt; &gt;??
 &gt; ??
 &gt; Linda Mann east TN zone 7??
 &gt; ??
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