RE: HYB: Daylight Independent
I do wonder if what you are seeing with Romantic Evening is delayed
bloom. You may wish to check the rhizomes in spring, perhaps some
digital pics, and then see what reblooms later. This would be useful
information. The reblooming seedlings would suggest some genetics are
there. The lack of consistence would suggest to me tht perhaps it is
not the same as other reblooming biology.
To get a good rebloomer we need several factors.
1) extra vigour , particularly so plant can still survive after
blooming rhizomes are killed by frost. This means no so much hardiness
as lots of increase.
2) Shorter maturity time for rhizomes. This means that an increase can
mature to bloom size faster then average.
3) Doesn't need winter estivation to set incipient bloom stalk. Could
possibly set bloom stalk with cool evenings or not even need estivation
4)Early spring bloom may be an additional factor or a reflection of
item #2, that is earlier maturity or faster growth.
5) Smaller trigger size for rhizome. This is a term I use to indicate
size of the rhizome needed to trigger a bloom stalk and support it.
Some of the Schreiner's iris need to nave large rhizomes before they
bloom and a number of them don't bloom in cooler climates as there
just is not the time to produce size needed in the growing season
available. The AB Walker Ross for instance can set up a bloom stalk on
a rhizome that in only 1" in diameter.
6) Lesser dependence on cool evenings to develop bloom stalks.
These are just some things off the top of my head. Others can add to
Forever Blue seems to have all these factors plus it is daylight
neutral, like the everbearing strawberries. You have repeat
raspberries and strawberries, that produce two crops a year and the
Daylight Neural strawberries that produce a small crop but
continuously throughout the year. Most rebloomers are like the fall
bearing Raspberries, and have two seasons. Sometimes these seasons can
come early, but still two seasons.
I have kept soil temperature here for several years and can go back and
look at t he data. I also have some rebloomers planted in an unheated
greenhouse, and the temperature there is much higher then outside,
getting over 40 C (105 F) on many days. Still, rebloom is better there
and sooner then on the same plant outside. The plants in greenhouse do
get a larger temperature differential between day and night
temperatures. I have noted a correlation between ground temperatures
and bloom time of Spuria Iris.
Date: Sun, 17 Feb 2008 20:21:51 -0800 (PST)
From: Robin Shadlow <email@example.com>
Subject: Re: [iris] RE: HYB: Daylight Independent
I know that Romantic Evening rebloomed for the Jedlickas in western NE.
Their peak is usually the first part of June, so the July rebloom
report would be less than 60 days. I haven't counted the number of
days, but have had 2 or 3 Romantic Evening seedlings bloom in the
summer. But certainly Romantic Evening is an extremely sporadic
rebloomer and unless it can be enhanced to become much more dependable,
it may not be all that useful. I just may have to try some Forever
Blue pollen on the Pink Attraction x Romantic Evening seedling that
bloomed last July.
Mike Lockatell has mentioned to me that soil temperature is
significant as well as cool nights to trigger rebloom. It would be
interesting to see if we can determine a preferred soil temperature for
the rebloomers which are daylight dependent.
What I really hope is that you did some sib crosses with your Forever
Blue x Immortality seedlings Chuck. If we could get some seedlings
that had both the daylight independent genetics from Forever Blue and
Immortality's trigger, we could REALLY make it hard for the growers to
have enough unbloomed rhizomes to fill orders : )
zone 5 NE
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