I think it will flower better w more sun.

I love mine so I ordered 2 more this spring lol. My first one was in sun most all of the day with a teeny bit of dappled afternoon shade, like around 4pm. Then the trees grew bigger and denser. It got more and more shade. It flowered less. A few weeks ago, I just totally moved it out front in a much sunnier spot on a new arch. I think it will be happier.

I am in a very humid environment. The more humid, the more straight-on sun plants can take. If you are in a hot dry area, you may be able to get away with more shade and still get flowering.

Thanks for your advice sultry. I live in the Houston area, so humidity is a constant here too. I don't mind moderately reduced blooming, but I wouldn't want the rose to sulk so much that it blooms infrequently and becomes more susceptible to diseases. I do have a sunnier spot, so I'll plant it there. Which means that I still have a spot open for a more shade friendly rose... .