Ummm.... I don't think seeds are killed by cold? Rather, freezing preserves seeds. In fact, the Doomsday seed bank is maintained at -0.4° F.
https://en.wikipedia.org/wiki/...
They might be eaten by critters, or washed away by rain, or buried... but freezing preserves them.
But anyway, after much searching through my messed-up files, I found pictures of my VB volunteers in 2007. Each tiny spec in this bed is a VB seedling. And all of my other beds looked much the same. They still come up, though not so many.
Karen
