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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 garden.

This information an now be co-ordinated with othe information.

Chuck Chapman

Date: Sat, 1 Mar 2008 14:04:41 -0500
From: "J. Griffin Crump" <jgcrump@cox.net>
Subject: Re: [iris] Re:  HYB: Daylength independent

See comments below.   --  Griff

- ----- Original Message -----
From: <irischapman@aim.com>
To: <iris@hort.net>
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
plants?
What sort of temperatures do you get day and night  in summer and in
October?

Chuck Chapman


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 on
weather, these timeframes can vary by 10 days or so.)

Last year, we had the following temperatures (no figures for July and
September):

Month            Avg high            Highest            Avg  low
Rainfall (in inches)

May                77.3                    91                    57.8
1.75

June                85                       96                    67.2
1.49

August            88.3                    102                  71.1
3.47

October          76.4                    92                    57.7
6.5

May was warmer, and October much warmer, than usual.  Otherwise, the
temperatures were fairly normal for here. We were, however, in an extreme drought until late in the year. Evaporation rate for each of the listed months was 99999.99! As a result, only two irises, ETERNAL BLISS and Sdlg.
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) or cut and brought inside before the freeze, to flower in November or December. The only other rebloomer during the year was CHAMPAGNE ELEGANCE, under its
oak tree, in the third week of June.

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