CULT?: Photoperiodic Irises?

Mark Cook asked:
>      Has anyone done any studies about Irises being sensitive to the length
> of the daylight hours?  My TB Irises basically sat and grew little until
> the last couple of weeks, even though conditions were suitable for growth. 

I have wondered the same thing.  Some seem to be controlled by
temperature, others by daylength, and I suspect it's a complicated bunch
of controls related to days of chilling and days without chilling and
daylength.  With all the variability in genetic background in TBs and
the possibility for genetic controls being turned on and off or mixed
around, I suspect it's even more complicated than the 'winter deciduous'
issue.

This would certainly be a good year to try to sort out some of that
stuff - things are all 'mixed up' in my garden as they seem to be
elsewhere.  DUSKY CHALLENGER has always been a late bloomer for me - one
of the latest.  It has stalks over 2 ft tall.  Most of my 'earlier' late
bloomers aren't showing stalks yet.  I HOPE they aren't showing 'yet'.

Pallida always seems to try to bloom early - might be triggered by
shorter daylength than others, or have less chilling requirement (which
would also explain why it might bloom relatively later farther south). 
VICTORIA FALLS seems to be very slow to get started - longer daylength
requirement?  Let me know if you find some answers and some way to apply
it in the <search for survivors>.

Linda Mann east Tennessee USA
soggy soggy soggy
We almost need another subject tag called GROWth for all the wierd
'behaviors'.
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