RE: Re: HYB: rebloom breeding
iris@hort.net
  • Subject: RE: Re: HYB: rebloom breeding
  • From: &* E* <1*@rewrite.hort.net>
  • Date: Mon, 1 Dec 2014 14:45:52 -0700
I live near Phoenix, AZ in Zone 9.  I hybridize for the longest bloom
possible.  I call it repeat bloom since autumn bloom does not seem to be
possible in my garden.  My best repeat bloomers will sometimes start
blooming in Feb. but usually about the first of March.  They will then
continue blooming untill late May or early June.  I consider any iris that
will remain in bloom for over 30 days, consistently, a repeat bloomer.  I
have had three seedlings that have bloomed continuously for over 90 days.
Though they don't do this every year,  I consider that very good repeat
bloom.  In my climate, they have to suffer six months in which the
temperatures will go above 100 degrees F.  They have only a brief period of
freezing in December or January.  April is the normal bloom month.
I sent my best repeat bloomer to my son in Vancouver. WA, a few years ago
where it put up bloom stalks for eleven months of its first year, but has
never done it again.  Something about the change in climate must have
shocked it into doing that.  I am going to be more observant and notice how
length of bloom varies from year to year in these repeat bloomers.
Francelle Edwards

-----Original Message-----
From: owner-iris@hort.net [o*@hort.net] On Behalf Of Chuck
Chapman
Sent: Monday, December 01, 2014 12:12 PM
To: iris@hort.net
Subject: Re: [iris] Re: HYB: rebloom breeding

After trigger is set, they can  bloom in June or July etc in zone 9 or 10.
But don't do this other zones. A carry through from  triggering and
vernalization epigentic set.

So  if you  don't have  environment for this  you won't get this  type of
rebloom. Involves  blooming in March, so then can have mature plants about
May and temperatures for bud set followed by five months of  
growth, takes you into November.  Then  plants primed and wait for   
growing conditions. If none then they are in  eco-dormancy  waiting for
growth conditions.  So need frost free growing conditions from about early
March to  mid to late November.  Of course  a colder area can receive one of
these primed plants and get  June,  July  or Aug 
(etc) rebloom   the first year but never again. One of the reasons I 
don't report one-off rebloom. Never know where trigger came from. Gives data
that is completely unreliable and deceptive.  When looking through rebloom
checklist I see plants recorded  often in zones 9, 10 and  once in a zone  6
or 7.  Probably  zone 6 or 7 rebloom  from a carry over from  origin of
plant.  So probably more then 40% of Preferential vernalization rebloomers
on checklist.

Plants with  this type of rebloom are Mediterranean plants that haven't
needed to develop genes to deal with cold weather. So will not carry  genes
for dealing with cold weather  unless they have accidentally picked them up
along the way.


Chuck Chapman



-----Original Message-----
From: Linda Mann <101l@rewrite.hort.net>
To: iris <iris@hort.net>
Sent: Mon, Dec 1, 2014 1:25 pm
Subject: Re: [iris] Re:  HYB: rebloom breeding

Sure would be nice to know how many of those are reblooming 5 months after
main bloom season and how many are reblooming earlier.

If they bloom in June or July in CA/Oz, do you think they are preferential
or recessive 'summer'?

Stanton sent me his rebloom records a few years ago - there were only a few
that were blooming in July/Aug, as I recall.

On 12/1/2014 11:02 AM, Chuck Chapman wrote:
> I took a quick look at 2008 checklist. I took samples of how many
plants
> are listed for  zone 9 or 10  only rebloom. About 33-40% of all of the
> 3388  iris listed.
>
> Those that rebloom only in zones 9 and 10 are the preferential 
> vernalization types (aka California rebloomers if you prefer that
term)

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