I planted 4 climbing New Dawn roses on my front arbour in late Spring. I had some blooms and some weaker stems with no buds. Do I cut them all down this fall or just the weak ones or none??
For detailed information, see Pruning Roses: A Toronto Master Gardeners Guide — There is a section on climbing roses, which mentions New Dawn by name. The Guide details when to prune (after the flowers have faded, with maintenance pruning in early spring) and provides a couple of links to helpful web articles.
See also a good article in Gardenmaking by Judith Adam, How to prune roses, which includes a section on climbing roses, including New Dawn.
I suggest that you also prune back the weak stems you mention. Remember that New Dawn blooms on new wood, so don’t prune away the flower buds.
All the best with your lovely roses!
August 27 2022