Re: Re: REB: fall cyclic vs other

Was this rebloom on Arctic Fox?  Please say yes.


<<A few weeks back he let me know that he got flower bud set om Arctic Fox
with 6-9 days of exposure to min night temperature of 19C [~66F]. >>




Betty Wilkerson
Bridge In Time Irises
KY zone 6


-----Original Message-----
From: Linda Mann <lmann@lock-net.com>
To: iris@hort.net
Cc: Chuck Chapman <irischapman@aim.com>
Sent: Mon, Nov 9, 2009 11:39 am
Subject: [iris] Re: REB: fall cyclic vs other


Chuck, do you know whether or not he is looking at other cultivars?

& how many hours were they were exposed to 19C and what the upper temperature
was?

I'm very curious to know what the range of temperatures for bud set is (i.e.,
maximum as well as the minimum he reports of 19oC for ARCTIC FOX), and how
much/if it varies among different types of rebloomers.

Since he's in Minnesota and you are in Canada, the minimum is of greater
interest there, but here the minimum is easy to reach - night time
temperatures are normally in the mid 60s by the end of bloom season here (mid
May) and stay there, or warmer, until Sept.

What happens if they are exposed to 20C or above for several months?

 <Richard Harkness at University of Minneapolis has read my study and is using
the data t orun some of his own experiments. A few weeks back he let me know
that he got flower bud set om Arctic Fox with 6-9 days of exposure to min
night temperature of 19C [~66F]. So it looks as if temperature, rather then
time is indeed the biological trigger for flower bud set. Chuck Chapman>

Linda Mann
east TN

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