Snake's Head Iris

Porterfield, WI(Zone 4b)

I am wondering how far north snakes head iris, or Hermodactylus tuberose is hardy? I seem to find everything from as low as zone 4 to zone 7.

Anyone grow these successfully in zone 4 or 5 by leaving these in the ground? I got some from Bluestone Perennials and wonder if I should plant them outside or not. Thanks for any help, Legit

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