Wow, I could use some of those!!* What a cool gift.* Do you have any idea which variety they are?* Sure you can leave them in their pots for the winter.* You are either going to have to sink the pots into the ground or heal in the pots with loads of mulch or leaves.* You don't want the pots to freeze, thaw and freeze again.* I think you're in zone 7, same as me.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.