CULT--ONE BLOOM PER RZ?

Hi Everyone--

An AIS friend of mine and I have a similar problem.  Several clumps of
iris TBs grow in the same garden with great foliage and very healthy. 
Only a few each year bloom.  she heard from somewhere that the rz that
gives off a bloomstalk blooms only one year and never blooms again. 
Blooms come only on the offshoots.  Is this true?  Could this be why not
all of the fans have bloom stalks?
Rima  terra@catskill.net
upstate ny  zone 4
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