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There have been discussions about raising Dutch iris and where they could be reliably grown. Here are a few I had extra from a plot which was planted about 3 years ago. These were planted in the sunny side of a drip line of a maple tree. They have bloomed every year, surviving nearly zero degree winters and very hot summers. These are still green after several nights of heavy frosts or freezing temps. I am on the border between zones 5b and 6a. The mulch is to help keep the weeds down and not for insulation.
I planted a few during the fall 2011. They came up and bloomed well. They are now coming up again. Not sure if that is because it was a mild winter, or not, but we'll see if they bloom next spring.
That's what happend here too, Paul. I thought it was because the winter was so mild, but they continued growing when spring came and then bloomed. This fall they came up again, and are about 5 or 6 inches tall.
I am on the border between zones 6b and 6a and they survived several mild winters. But they did not survive this winter with two weeks of minus 20 to 23 degrees Celsius in February.
