Francesca---Yes, I would scrape off some of the outer layer of the stem at the bottom, and I would definitely cover your pot outside with a jar or plastic bag. It's worth a try. I remember that years ago, when I dug out a clematis from a friend's house, to transplant it at my house, someone said I might as well just throw it away, that it would never take. But the man at the county extension office said, Sure--give it a try--just be sure to keep it watered well for the first few weeks. So I did, and I still have that pretty clematis. What do you have to lose?