Re: Pineappling and bloomout

From: "Jeff and Carolyn Walters" <cwalters@digitalpla.net>

Glynn,

Welcome to Iris-talk!

>I have imported TBH from Schreiners and from Australia.  Some of the
irises overbloom and >the iris is lost and some developed deformed growth
with short stems ? 'pineappling.'
>Are the above problems part of acclimatisation or viral or the transfer to
warmer climate?
>Is there a way to save a plant that has a flower on every fan?  Does
fertilization of the bloom >perhaps force a side fan to develop?
>Any suggestions are welcome.

My understanding is that pineappling is a physiological condition most
likely to manifest itself in relatively mild and warm climates (probably
including yours). I have occasionally observed pineappling in newly planted
rhizomes acquired from places such as California or Texas, but never in
locally acquired rhizomes or iris that have been growing in my garden for a
full year or more (I live in what I imagine could be labeled a "cool"
(semiarid) temperate climate).

There has been quite a bit of discussion on this list about stimulating
growth from cultivars that have exhibited "bloomout". Most of the
techniques suggested are based on the theory that it is necessary to fool
the reluctant rhizome into believing it is at death's door and must
replicate itself now or never. A visit to the Iris-talk Archives might be
instructive in this regard. In accord with what Mark Cook mentioned, I have
had apparently "bloomed out" rhizomes spontaneously put out fresh increase
later in the season when just left alone. RECHERCHE did so this year.

Jeff Walters in northern Utah  (USDA Zone 4, Sunset Zone 2)
cwalters@digitalpla.net








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