How to prepare trees for winter?

Greetings, last fall I harvested some wild pawpaw seeds, kept them in the fridge over winter and sprouted them in the spring of this year.  Now I have 5 paw paw trees about 6 inches tall in nursery pots.  What do I do to prepare these plants for winter? I have an unheated greenhouse i could leave them in.  Should I plant them in the ground?  I'm in zone 6B

Eric Hammond wrote:Greetings, last fall I harvested some wild pawpaw seeds, kept them in the fridge over winter and sprouted them in the spring of this year.  Now I have 5 paw paw trees about 6 inches tall in nursery pots.  What do I do to prepare these plants for winter? I have an unheated greenhouse i could leave them in.  Should I plant them in the ground?  I'm in zone 6B

Sorry I can't help but I need to know as well, I only have 2 left from 6 slugs ate the others but I would like these 2 to survive the winter.