RE: HYB: ? rebloom genetics (was Renown x Immortality)

-----Original Message-----
From: iris DIGEST <iris-owner@hort.net>
To: iris-digest@hort.net
Sent: Sun, 31 May 2009 11:45 am
Subject: [iris] iris DIGEST V1 #855
You won't get any rebloom until the plant initiates a flower bud, which occurs when you get about 5 nights in a row with minimum temperature above 15C (for me in Canada) or below 22C for you in Arizona.
I'm not sure why your plants would bloom in Feb as the only other times that I'm familar at that time had suplimental light . Most iris plants would be photo period dormant at that time. Allthough there are some that are temperature dormant. But most would not be growing under such low daylight periods.
I wouldn't consider Feb bloom to be rebloom without additional data.Such as what is the lighting plants are getting at that time, number of days of temperture in row with temperature maximum around 10C and number of days with temp above 22c , which can reset vernalization cumulative hours. It could very well be early spring bloom triggered by various circumstances.
Immortality seems particular senmsitive to high temperaures, in that it seems to be triggered into heat dormancy at lower high temeratures thenm a lot of other cultivars. 

Chuck Chapman

Date: Sat, 30 May 2009 17:06:27 -0700
From: "Francelle" <fjmjedwards@q.com>
Subject: RE: [iris] HYB: ? rebloom genetics (was Renown x Immortality)
Yes, Betty, I had it in two beds, no luck. It was in full sun. Most of my 
irises bloom best in full sun.
I have been reading the discussion of fall rebloomers and summer rebloomers. I seldom have an iris rebloom in the fall. In fact we seldom have any fall. 90 degree temperatures last into November, then in less than a month we will have night freezes. Some try to bloom in the winter and usually get frozen. My usual pattern for rebloomers is early February bloom then sporadic bloom 
through March, April and May.  Would these be called summer rebloomers?
One blue amoena seedling that I've almost tossed twice, won third place in a popularity show in March. About two weeks ago it sent up two more very nice 
stalks.  The temperature had been above 100 for fourteen record breaking
days. Another seedling started blooming on Jan. 28 and had stalks blooming 
continuously until April 1.  A pretty iris that will bloom well over two
months without losing any vigor is desirable in my opinion.
It looks as though the last iris standing in my garden this year is Total 
Recall.  It has been blooming for six weeks and is still beautiful.

Francelle Edwards  Glendale, AZ  Zone 9

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