I grew this daylily in zone 10, where it began blooming in May or June, depending on the weather, and almost continually bloomed until Aug./Sept. It was not dormant in zone 10. Instead, it was what I would describe as semi-dormant. It was tough and lovely! One of my favorites. I sent some fans to friends in Charlotte N.C., Montgomery, Al., and San Antonio, Tx. They bloomed for them within 2 - 3 months. They are all delighted with Siloam Classic Double.
Then we moved to north FL in zone 8. In late fall of 2013 my cousin, whom I had sent fans to in San Antonio, sent me some fans for my new garden here so SDC came full circle.
However, this June was an absolute beast with zero rain & extraordinarily high temperatures for the entire month. I believe I have lost her.
I'm still waiting to see if she will show up during September.
