I have a clematis and do not know the variety. I have no idea when and how to prune it. Can anyone help please ? Thank you.
There are many, many different varieties of clematis, but your's looks like the very common Jackmanii clematis. https://www.gardenia.net/plant/clematis-jackmanii
It does look like my Jackmanii, though this one has 6 petals, lots of the flowers, only have 4 petals.