I am interested in runners perennial to my zone 6 conditions that I can also plant without concern in winter or even fall. Because of this, and with confidence in the mixes provided by this community, I planted half my runners in late January under our Nanking cherry.
A full discussion of my plan and motivation might be outside the scope of the thread, but I had it clear in my mind before planting that it was entirely possible that not one would survive the winter and germinate.
If I somehow had some guarantee that at least one plant from each different variety would make seeds I would probably have planted all of them 
I am watching closely to see what they do. One of my winter-planted pole beans shot out of the ground last week so my guess is we’re approaching the time where survivors start to surface.
If nobody’s up by July, my first batch of runners is probably a bust. If I get one or more I can decide whether to give them some friends or plant the others in a different location.
Come on, runners! You can do it!!!