Newly planted Clematis Armanii - should I prune it?

[Katy4321]

I planted it about 2 weeks ago and the flowers have now gone. I accidentally broke the growing tip off when planting and the whole plant is currently just a single stem. So I'm thinking it may be best to cut back to about 30 cm tall (a woody section) just above some bud to encourage multiple new shoots?

https://www.rhs.org.uk/plants/clematis/group-one-pruning-guide

No. Armandii don't need pruning unless they are outgrowing their space then it's usually just a light tidy up immediately after flowering. The same as with early (May) flowering ones.
It's only the summer flowering (June onwards) ones that get cut down to 30cm each spring.

Thanks that slightly confused says to cut group one back at planting, but don't renovate or prune Armandii (was sure it that meant established plants only)

Thank you. It is newly planted with currently just one stem . Will it sort itself out and grow more if I leave it?

RHS website "Initial pruning and training
If young clematis plants are left unpruned they often produce very long single stems with the flowers produced only at the very top.
Unless the plant already has three or four healthy stems growing from the base, all newly planted clematis should be pruned back hard the first spring after planting. Cut back to just above a strong pair of leaf buds about 30cm (12in) above soil level. This will encourage multiple stems which can be trained to supports to give good coverage.
During the spring and summer, tie in new growth, spacing stems evenly on the support."

Read the whole page.

Definitely don't prune. Leave to do its own thing. It's an evergreen if I'm not mistaken with lovely foliage. Mine is still in full flower ( and huge )