Hard to say what it's weaknes is. But I have heard from a few people who also commented that Epicentre isn't hardy for them. Last winter I lost lots of plants and Epicentre seedlings took a very hard hit.
We do have very difficult springs here. Spring comes slowly. It is cold and wet and many freeze/thaws which is hard on plants.
Another factor which seems to be important is the min temperature during summer. The min temperature being above 16C and below 21C seems to be important. We don't get a lot of min temps above 16 until mid August, and then not too many before it goes below this .
Do you have min/max eadings in yuour garden? if not then what is closest weatehr station with online records?
Sent: Fri, Oct 9, 2009 10:19 am
Subject: Re: [iris-photos] RE: Dark Top plicata IB
Very interesting color pattern. Not all that pretty but interesting!
Epicenter grows OK for me in Colorado. We went from 80 a few days ago to 28 this morning with heavy frost. It isn't uncommon in the winter time to be at 20 below and sunny and 60 a few days later so maybe it isn't a cold hardiness gene it lacks but cultural condition that they don't like. Or soil pH? So I'm rethinking the hardiness effect on many varieties. I thought certain varieties wouldn't grow in Colorado due to our cold climate. I noticed this year with the extra moisture we received during June and July, varieties which I was about to give up on because they just wouldn't increase put on tremendous growth. We are considered a semi-arid climate and normally don't receive much more than 12 to 15 inches of moisture for the whole year. This year during June and July we received about 7 inches of rain and the Iris drank it up without any rot or leaf spot. Varieties which I thought didn't like Colorado due to a lack of cold hardiness gene now I will consider growing on due to the cultural condition I had put them under. I just need to supplement with more moisture during their critical growing period. For what it is worth.
Bob in Denver
Iris4U Iris Garden
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Sent: Friday, October 9, 2009 7:04:46 AM GMT -07:00 US/Canada Mountain
Subject: [iris-photos] RE: Dark Top plicata IB
Here is one of my dark top plicata seedlings. This one is an IB from Eoicentre X Summoned Spirit.
Hopefully it will have hardiness of SS and not that of Epicentre.