For that it will probably be fine. I'm assuming it will then be
painted? If so, the color shouldn't be an issue.

I'm not that enamored w/ poplar as the wood choice, though. Even if there
isn't any direct water exposure, I'm assuming this is in contact w/ the
cement patio and poplar isn't very good at all for moisture resistance.


Yes, painted white. Anything else, other than poplar, like oak? I looked
at pressure treated, but it was waaay too rough and gnarly, even the #1
grade lumber.