St. Helen's Wake

‘St. Helens’ Wake’ (Richard Ernst, R. 1983). TB, 42″ (107 cm). Midseason bloom. Ruffled and laced blue white, light yellow shoulders; laced style crests; yellow beard tipped white.

https://wiki.irises.org/TbPthruT/TbStHelensWake

This plant does very well in zone 5 with freeze/thaw cycles.