Russell in Michigan wrote, >All appear to be reliably winter-hardy here. I know of a plantsman in >Wisconsin who winters C. goulimyi. That's hard to understand when the ground freezes so deeply in the upper Midwest, and these crocuses start growth in fall. Does the ground never thaw during the winter? Are they somehow in suspended animation? How can they survive? In milder, but still cold-winter, climates, repeated freezing and thawing are hard on low-elevation Mediterranean crocuses. Jane McGary Northwestern Oregon, USA