Reblooming Bearded Irises, Superstition?

In 2001 I planted some bearded Irises of the variety Superstition at my home in western Arkansas, zone 6b. Ever since, they have consistently rebloomed. Have blooms in late November and early May. No one else around me seems to have reblooms on their Irises. Are some varieties more prone to rebloom than others?... show more In 2001 I planted some bearded Irises of the variety Superstition at my home in western Arkansas, zone 6b. Ever since, they have consistently rebloomed. Have blooms in late November and early May. No one else around me seems to have reblooms on their Irises. Are some varieties more prone to rebloom than others? Or is some element in the soil a factor? Just wondering if anyone knows. Thanks.
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