USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
I have also received the imposter Spartan cultivar, but never the true cultivar until I ordered it directly from the hybridizer, Schreine...Read More
Hespiris is right that most of the photos and my own plants don't match the description and one of the photos I've seen. So has the orig...Read More
Too many irises sold as Spartan are wrong. I have yet to ever receive the correct cultivor.
Spartan is described as: "Dar...Read More
HM 1974 AM 1976