Re: HYB: fall rebloom genetics
iris@hort.net
  • Subject: Re: HYB: fall rebloom genetics
  • From: C* C* <i*@aim.com>
  • Date: Sat, 30 Apr 2011 12:07:53 -0400
Somehow I doubt if day length make much difference in timing of spring bloom.
I suspect more temperature and time to grow a bloom stalk from trigger
temperature. And this will vary according to day temperatures.

A factor could very well be the carry over of  an immature  flower stalk from
fall. One that started but  climate conditions  stopped growth, and flower
stalk not  big enough to be bothered by lower temperatures.

When  you can get full bloom season in California in March, then  the day
length that they get there  that triggers flower stalks will be the critical
daylength. The triggering will obviously be  a couple of weeks before a TB
actually blooms.

Of course SDB will need less time to go from trigger to flowering.

So look at  daylenght in early March for California, and then check  when your
daylength corresponds, and then check with your  bloom data.

I can provide you with some formulas  that predict bloom based on warmth,
amount of daylength etc,  They are in the book "Manipulation of Flowering"
edited by Atherton.  But  basically I'm not sure they add much to a good
prediction.

Weather  webpages  such as weather underground, can give you daylength
information for various locals and dates.

Chuck Chapman












---- Original Message ----
From: Betty Wilkerson <autmirislvr@aol.com>
To: iris@hort.net
Sent: Sat, Apr 30, 2011 10:27 am
Subject: Re: [iris] HYB: fall rebloom genetics


<< Make note of these as they should be the ones
ou use for "Summer rebloom"  Has to do with going directly from bud set to
lowerstalk.>>

Chuck,

The "Summer Rebloomer" are ready to go as soon as the temperatures warm up.
The early blooms were on my 'All Revved Up' (it can bloom from frost to
frost)
and 'Lunar Whitewash' followed by 'Matrix.'  Most seedlings showing hope for
summer bloom were in this group also.

Fall cycle rebloomers depend on day length as a trigger.  The later ones
(this
spring) are primarily fall rebloomers or so I thought--'Again & Again,'
'Tara's Choice,' Theme Master,' 'Vanishing Act' etc..  In 2006 this group
bloomed before anything else.  (typically do)

'Summer Radiance' has often been my first spring bloom, but this year it was
way behind the earlier ones.  'Star Gate' gave an early stalk, some middle
stalks, and there are two more that don't even show color yet.  SG is
typically later than the rest with spring bloom.

'Over & Over' has been among my most dependable rebloomers, often blooming in
the summer.  It bloomed with the middle group.  Renown was between ARU group
and the Tara's Choice group.  About normal for Renown.

Betty W.




-----Original Message-----
From: Chuck Chapman <irischapman@aim.com>
To: iris <iris@hort.net>
Sent: Sat, Apr 30, 2011 8:20 am
Subject: Re: [iris] HYB: fall rebloom genetics


 Linda has also noted this at times.  Most of these should be the summer
ebloomers or as I call them the direct rebloomers.. they respond to a
emperature trigger. So most years are the first to bloom, but with differernt
eather  can sometimes be later. Make note of these as they should be the ones
ou use for "Summer rebloom"  Has to do with going directly from bud set to
lowerstalk.
Chuck Chapman




--- Original Message ----
rom: Betty Wilkerson <autmirislvr@aol.com>
o: iris@hort.net
ent: Sat, Apr 30, 2011 7:30 am
ubject: [iris] HYB: fall rebloom genetics

he iris season has been weird here.
During a typical spring season, most of the rebloomers begin in the first
eek
of iris season.)  This year, some of the "early birds" did not begin
looming
ntil the second week and even later.
Chuck, is it possible that their bloom season is controlled by day length in
he spring as well as in the fall?  Thus they do not respond to an early
eason in the same way as the rest?
If not, is there another explanation?
Betty W.
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