Perennials: My Ruby Coreopsis looks dead, 0 by BeginnerLucky

BeginnerLucky wrote:
Winging, it is a bright dark red, if that description makes sense. Practically maroon but very vivid. Here's a picture of mine from last year (I have no idea if it survived the winter, because I moved away last fall).

I had always heard that this variety is not winter-hardy, but the two I bought this year don't seem particularly summer-hardy either. Problem is, my husband loves them, so I'm probably going to be forced to buy them every year...