I just prune out dead wood. It does make clusters. You can deadhead, but it is not really needed for once bloomers. It is a beautiful rose.

Sheila - thank you! I love it, though the squirrels keep munching on it the very early growth so lose a lot of the blooms.
But what time of year do you prune after blooming (eg July) or late winter? I’ve seen both recs - hence my confusion. And you don’t cut back the laterals at all? Also - does yours always make clusters? My randomly cluster flowerers, or not...

You can prune dead wood anytime. I just let mine loll about and do what ever it wants to. I think it makes clusters and singles. Usually people prune once bloomers, if they want to prune, after the Spring flush to avoid losing bloom.