Re: Re: CULT: Growing Iris South Florida
iris@hort.net
  • Subject: Re: Re: CULT: Growing Iris South Florida
  • From: C* C* <d*@rewrite.hort.net>
  • Date: Mon, 10 Nov 2014 19:04:57 -0500
Look at my article "Plant Maturity, Temperature, and Rebloom" in April 2010 AIS Bulletin.
The increase on your germanica occur after central fan dies. It represses growth of increases while it is vegetative state. Can't repress after it dies. Called apical dominance. With your example, this is a maladaptive state. Unable to receive appropriate and needed environmental signals.
Many of your questions can't yet be answered. But no connection between rebloom and plant survival. signals precede rebloom, where environment enables them.
There are people breeding for rebloom in warm climates, Linda was talking about who has been active in discussion.
No photoperiod triggers in iris, just cold signals. Aphylla has endo-dormancy, almost all others have eco-dormancy. 

Chuck Chapman



-----Original Message-----
From: Phloid <4390a9e81@rewrite.hort.net>
To: iris <iris@hort.net>
Sent: Mon, Nov 10, 2014 3:56 pm
Subject: Re: [iris] Re: CULT: Growing Iris South Florida
You are referring to folks breeding for rebloomers no further south than 
7b? Isn't Walter Moores in zone 8 MS? Where was Bernice Miller? She no
longer is a breeder of course.

No one in TX breeding for re?

On the matter of blooming and vegetative cycles. I'm pretty confused as
to what has been said. My fault since I haven't read all the past posts
intensely enough to glean this out. Chuck and Linda, are we still at
question on whether or not they are intertwined so tightly that lack of
rebloom will definitely cause malfunction in the vegetative cycle at
some point? Even if we allow that the veg cycle might manage a year or
more of continued cycling before fizzling out. (I understand lack of
vegetative growth will eventually shut down blooming due to inadequate
energy resources alone. But this is more or less reset independent.) Or
can veg and bloom cycles be independent on their mechanisms for how each 
gets vernalized and/or otherwise reset? Hope my questions are
understandable.

An illustration of why I ponder this: I have different cultivars whose
clumps grow and increase for years with little blooming. I curse my
Germanica; it is so sparse to bloom yet grows/increases like a weed. It
just seems we have to have this going on:
Mother rhizome gives rise to increases. The mother dies without
blooming. The increases become mothers and the same cycle happens. The
cycle can go on multi-year with rhizomes behaving in a exclusively
vegetative mode. It happens in other rhizomaceous plants, no? Of course
different plants groups have different pathways so this is not in any
way a certainly in TBs, just evidence of a possibility. Within genus
Iris, some of the beardless seem to do this, no? Iris pseudoacorus?

Or is it possible that, provided the various rhizomes in a clump stay
functionally capable of transferring reset signals to each other, the
bloom of 1 or more rhizomes can transfer the needed reset signal to the
rhizomes cycling in vegetative mode? This would allow sparse bloom on
the part of the functional multiple rhizome unit (the clump or parts
thereof) but success overall.

Potentially this could require human intervention at some point to
divide & reset the units (thereby maintaining functional
interconnection?) Reset is a given we accept as part of culturing TBs
overall. And more intensive disease control in FL might be just part of
the way to be successful. (We accept this for golf courses. etc) Not a
deal-breaker. So in FL, maybe not easy, but doable.

Please pardon so many hypotheses in one lump.

Shaub Dunkley





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