None, Roses grow best with 6 hours of sun daily.
As often as I've tried to push the envelope with shade, I've failed.

If partly depends on how much shade. I am growing Double Knock Out in an area that doesn't get as much sun as I'd like--maybe 5 hours maximum. It is healthy and blooms--but not as often as my other Double Knock Out planted in full sun.

Since the Knock Outs are very disease-resistant, I haven't had any disease problems, but with just about any other rose planted in that same spot, I would expect it to have more disease problems.

Let's face it--roses love the sun.

Kate

I have HomeRun at the base of a large varigated willow and it is lovely.

Some people say part shade works for them others say no. My dillema is not knowing what kind of shade I will have in a couple of years when tree limbs grow. For all I know, the city can come cut again and this area stays sunny. I've heard the red KO does the best in part sun