Looks like last year's collard plants are surviving winter in SE WI! [View all]
I have very little experience growing collard. I've made two attempts. The first failed badly (late planting), and the second seems to have survived all that this year's winter in SE Wisconsin has thrown at it.
It's been quite a mild winter by local standards, so I'd say this is something sort of 'flukey'. A week ago, the plants looked bad with sagging, downward pointing leaves. Today, the leaves on all of them are pointed up! I don't think that sort of response would happen to "dead" plants. They really do seem to have responded to recent February rain.
I'm going to keep an eye on them... if they make it into June, I think I'll beatify them, and look forward to a source of "hardy" seeds.
It wasn't as nearly as cold here as the rear end of a southbound polar bear in a typical February. But our mild winter was interrupted by a 21 inch snowfall that buried them for over a week, and it's in that timeframe when the overnight temps were hanging a bit below zero F.