This plant is said to grow outdoors in the following regions:
Durham, Maine
Glenelg, Maryland
Groveland, Massachusetts
Waynesboro, Mississippi
Auburn, New Hampshire
Sandown, New Hampshire
Coshocton, Ohio
Mount Gilead, Ohio
Ravenna, Ohio
Fond Du Lac, Wisconsin
Marion, Wisconsin
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Very vigorous in NE Ohio; in 6 years I have divided it 3 times.
Very hardy in my zone and beautiful. Lives in my raised wooden bed with no problems. Would love to get a tetra version.
4.5" pink blooms with a red eye,20" scapes,Henry P (1979)