HYB:REB:Rebloom ability

In a message dated 11/16/2006 10:02:31 P.M. Central Standard Time,  
irischapman@aim.com writes:

<<I susspect that there are a number of genetic factors in  rebloom, as well 
as 
several types of rebloom.>>
I'm sure you're right. I prefer to change the "types of rebloom" to  say 
"rebloom triggers," but it's still basically the same thing.  In  The World of 
Irises these triggers have been listed as types so it the  tradition.  

< <<I used to think that vigourous  growth was an absloute necessity, but 
Bella Rosa 
barely hangs on, yet  reblooms almost every year. A poor grower. Strong 
growth is 
a factor with  most rebloomers, as is eary bloom for it's type.  >>


Me too, but I've raised row upon row of TB rebloomers and can tell  everyone 
that there are many poor growers that rebloom.  It's heart  breaking to have a 
beautiful rebloomer that just won't grow.  I've had  rebloom seedlings, with 
superior qualities, bloom out.  They couldn't  produce enough increase to stay 
ahead of the bloom and rebloom.  One of my  favorites from the 1810 cross, a 
pale yellow which I posted this summer, looks  like it will be one of these.  
Fortunately other favorites from the cross  are quite prolific.  

 

<<I suspect some early rebloom is "leftover" spring bloom. That  is, the buds 
were already set, but plant wasn't quite big enough in ?spring to  reach the 
cultivar's "Trigger Size" (the size of rhizome necessary to trigger a  bloom 
stalk). Thus basically a delayed bloom.>>
 
 
This type of rebloom is listed in The World of  Irises  as Repeat bloom, one 
of four classes.
 
The repeats do appear to bloom on late maturing rhizomes.  Others have  
argued that this is not rebloom.  I do think there is opportunity for this  class 
to be confused with sporadic bloom in the temperate zones.  Or maybe  they can 
be encouraged to grow well enough to mature more rhizomes and also  produce 
fall bloom?  Normally, Summer Radiance goes dormant after the  repeat bloom and 
looks like it has bloomed out, but puts up more increase in the  fall and 
starts all over.  
 
Maybe we have more repeats than we know??  With two  different collections of 
several hundred tall bearded irises, I've seen  less than a dozen repeat over 
20+ years.  Two seedlings this  spring.  
 
If grown very well, can this characteristic be duplicated in  other 
documented non-reblooming irises?  
If an iris only blooms  off season one time, is it still a rebloomer?  Does 
it have the rebloom  genetics?  Of course, it does.  Otherwise, it couldn't 
rebloom even  the one time.  
 
Some irises can never be induced to rebloom.  
 
To me, it makes more sense to classify all irises with rebloom genetics as  
rebloomers and then differentiate within the group.  
 
________________________________________________________
Betty W.  in South-central KY Zone 6 ---
Bridge In Time Iris Garden@website:
Where  the seeds are in the pots once again! 
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(http://www.thegardensite.com/irises/bridgeintime/) 
_Reblooming Iris - Home Page_ (http://www.rebloomingiris.com/)  
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