HYB:Germination:Observations:Temperature and time
I'm not a scientist. I simply observe in my own garden.
In the spring, I eagerly await the first sprouts in the iris seed pots!
This can happen any time from the third week in February to the first week of
April, depending on the season. Spring temperatures trigger the beginning of
the observable parts of outdoor iris seed germination.
A part of my spring routine is to note when the first sprout appears
(visible) on each cross! In earlier years I also counted the seedlings about once a
week and noted it in the workbooks. Several years ago, I determined that
the time span from first sprout to last sprout, of a given cross, was
approximately a month. This has held true without regard to the time that sprouting
began for that cross.
This one month span seems programmed into the iris seed, and may or may not
be connected to the bloom cycle. Early bloomers sprout early and late
bloomers sprout late? Anyone kept records?? Anyway, when a month has elapsed the
seed shut down. I suspect this is DNA triggered by time. Is it day length?
I have no clue. It's never been on my HAVE TO KNOW list! I just know it
This month of time each spring is when I find it crucial to keep the pots
My observation? The iris seed has completed a cycle at this point. If left
outside, more seed may sprout the next spring but will follow the same
cycle. Sometimes a few seeds will sprout in the same (first) fall. (Or any
fall.) These do not require the same cycling as the average seed. The program
(DNA) is different for these seed.
What is different?? What is missing, or present, in their DNA compared to
the average iris seed?
Betty W. in South-central KY Zone 6 ---If you don't cross them, you can't
Bridge In Time Iris Garden@website:
Where the seeds are in the pots once again!
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