I have a new Clematis montana which appears to have had all the bark stripped from top to bottom! The remaining leaves have started to wilt (it has lost most leaves) although they do not show the signs of Clematis wilt. It is grown against a fence/trellis which has horizontal, fairly deep scratch marks on it. Another established montana nearby is fine and still in full leaf.
I am very perplexed, does anyone have any ideas please?