Do I prune climbing roses growing in a container against a patio wall the same as ordinary roses?
The best bet is to plant in the open soil. This can be done by cutting through paving, tarmac or concrete. While this might seem like more trouble, it removes the need for watering.
Prune the rose by tying in the main shoots and shortening back the stems that have flowered, which arise from the main stems, to about 10cm.
More on pruning: https://gardenie.wpengine.com/gerrycategory/pruning-roses/?id=5587