Re: REB: Rebloom Questions...

Linda Mann wrote:
> 
> Rick - When you say temperature is the key, what do you mean?

Above 32 degrees.

> Cumulative cooling or minimum or below some maximum?  I was mostly
> wondering about the twice a year bloomers rather than the continuous
> bloomers - do you mean that twice a year bloomers can bloom any time in
> your climate or just the continuous ones?

Yes, twice a year or everbloomers can bloom at any time.  I get much
bloom in the heat of the summer for instance. 

Seems like last year, Tom Little or somebody (there goes that steel trap
again) posted a detailed
> story about timing and development of flower bud primordia in once
> bloomers - that the bud primordia form right after bloom in the spring,
> then rest over the summer, grow in the fall, rest over the winter and
> get killed in the spring (woops, sorry about that) BLOOM in the spring.
> So I was wondering when the twice a year bloomers get their bud
> primordia formed - 6 months ahead or a year ahead?  Or are you saying if
> they can bloom anytime of year if the temperature is right, then does
> that imply that high and low temperatures both shut down twice a year
> bloomers, but only low temperatures shut down ever-bloomers?  And that
> flower primordia can form any time of year in both kinds of rebloomers?
>

What question do I answer here?  It seems from my observation that some
rebloomers can bloom at anytime.  Others are more cyclic and bloom most
of the time in the fall.  And of course everbloomer rebloomers bloom
almost continuously.  But, freezing weather 32 and under will shut them
all down.  Not so with heat.  I regularly have rebloom during our hot
summers over 100 degrees.  Keep in mind also that the increase must be
mature. I cannot stress this enough.   

> Does anybody out there know how long it takes from the time an increase
> becomes visible till it blooms on an everbloomer or a twice bloomer?
> For a tall bearded iris - fastest time.
> 

Again from my observation the time is variable depending on the variety.
How fast does the increase mature.

Rick Tasco
Superstition Iris Gardens
Central California
Zone 8
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