Posted: 05/05/2013 at 17:17
There is a good website Taylors Clematis which has just about every variety on it and about care and pruning. Here is the pruning page.
It says Dr. Ruppel is group 2, light pruning. But it says a bit more about it so do have a look.
I saw your clematis on another thread and have been searching for it ever since, even when we went to England in April. Then the supermarket here in France had one of that name. But now a flower has come out and it looks just like Nelly Moser, which I have already. We'll be back to England in June.