Thanks, Nan! I just went down into the growing field to see if there were still scapes from last year that I could measure and discovered that it did not love our unusually cold lows this past winter and my good clump is now a DF! It was the coldest in decades, with the usual brutal bounces; two cold snaps got down below zero in the valley where it grows.
Such a shame, because I really like it.
So I'm retracting my hardiness endorsement and planning on replanting in a higher, warmer spot. It really is an evergreen and gets picky about the cold!