Posted: 14/08/2015 at 23:30
I have moved montana successfully...quite large in fact...but I think it better not to. I would not advise it but I do do it. if you are sure you want to try it go for it but wait until the autumn, mid September. The soil will still be warm.
Just for info though....often when I have moved clematis I have found they have grown again from pieces still left in the ground. A sharp saw or serrated knife straight through the root system can produce a couple of large plants.