Re: iris DIGEST V1 #505
Thanks for the details. What I note, is that you probably didn't have
cold enough nights to trigger what is needed, probably flower bud
differentiation. The high temperature dormancy starts at about 40C or
about 105 F. Of course very dry weather can also slow down biological
activity, but aparently rebloomers are supose to have extra long roots.
Thus rebloom at higher elevation. Haunting doesn't sem to be efected
by same conditions. Perhaps temperatures wer low enough for it in your
This information an now be co-ordinated with othe information.
Date: Sat, 1 Mar 2008 14:04:41 -0500
From: "J. Griffin Crump" <email@example.com>
Subject: Re: [iris] Re: HYB: Daylength independent
See comments below. -- Griff
- ----- Original Message -----
Sent: Saturday, March 01, 2008 12:41 AM
Subject: [iris] Re: HYB: Daylength independent
Thanks for the information Griff.
When is your spring bloom?
Is there any possibility of plant heat dormancy in some of ther
What sort of temperatures do you get day and night in summer and in
Chuck -- SDBs start blooming about the first week of April here. TBs
begin around the last week of April and peak about mid-May. (Depending
weather, these timeframes can vary by 10 days or so.)
Last year, we had the following temperatures (no figures for July and
Month Avg high Highest Avg low
Rainfall (in inches)
May 77.3 91 57.8
June 85 96 67.2
August 88.3 102 71.1
October 76.4 92 57.7
May was warmer, and October much warmer, than usual. Otherwise, the
temperatures were fairly normal for here. We were, however, in an
drought until late in the year. Evaporation rate for each of the
months was 99999.99! As a result, only two irises, ETERNAL BLISS and
04R3, rebloomed here last fall, versus the 24 that rebloomed in 2006.
ZURICH put up a stalk, but was frozen in the bud. Nonetheless, four
seedlings achieved maiden bloom either in the garden (end of October)
and brought inside before the freeze, to flower in November or
The only other rebloomer during the year was CHAMPAGNE ELEGANCE, under
oak tree, in the third week of June.
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