What adaptation allows Hemerocallis (Daylilies) to reliably survive brutal winters?

Answer

They die back completely to the crown, waiting out the worst of the weather.

Daylilies are reliable cold-tolerant bloomers because they enter dormancy, dying back to the crown, and possess deep enough roots to handle significant freeze-thaw cycles.

What adaptation allows Hemerocallis (Daylilies) to reliably survive brutal winters?

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