Janet Tweedy wrote:
Charlie Pridham gave several suggestions for good north facing clematis
which might be in the archives. They are worth a try.

There's a few: 'Mrs Cholmondeley', 'Nelly Moser', 'Perle d'Azur',
'Victoria' and any form the Viticella Group. My friend Rachel has a
nursery in cumbria ran with her parents. I was looking for one north
facing, with the name Penny in memory of a friend who died a few week
ago. Sadly couldn't find any but she suggested a rose, Penny Lane,
which is perfect. They are very helpful and friendly. Do check them
at:-

http://www.ukclematis.co.uk/