Mary, Howdy
I'm not of Arizona, but it's basically desert, and no rain, hear in summer.
Zinnia's will grow in full or part sun.
I have some in East facing flower bed. They get only morning sun, bloom until frost gets them.
They re-seed themselfs, allthough I help my favorite colors along, by crushing up dry flower heads. 👍👍
Ta. Ta.😀
😎😎😎