Peachymomo -- You don't say where you are located, and that makes a huge difference.
That said, if there isn't enough sun for morning glory, I doubt there will be enough sun for roses.

Also -- Again, you don't say where you are located, but in my experience, in Southern California, those wooden half-barrels rot out just about the time a rose is really well-established.
We have handled this problem by building small stackable block walls around the outside of the rotted barrel, and then pulling the wood out by hand.
That is not always practical, however.

Jeri

What about Climbing Pinkie? I love mine!

What Jeri said ... if there's not enough sun for morning glories, there's not enough sun for roses. ZD would probably survive in your situation, but it wouldn't thrive or bloom the way it should.

For me, in Virginia, ZD puts on a wonderful show in the spring, and has a flower or two off and on through the summer. I have her in full sun all day, on an arch in my rose field.

Connie

If the barrels rot I'll just do something with rock, I like rock more anyway but I figured
I would start with what I have.

*** I understand.
But I have done precisely what you plan to do, and NOW I know why I was advised not to do it.

We come back, however, to the basic problem.
If you have too much shade for morning glory, you have WAY too much shade for roses.

There are some climbing fuchsias.
I have one -- F. hatchsiae, which is commonly sold as F. regia.
It is a climbing, vining species fuchsia, immune to fuchsia-gall-mite, and blooming all over in a cloud of teeny red flowers.
That might tolerate your conditions, and I do actually grow it in a monstrous glazed pot.

I have another wonderful climbing fuchsia, but the label was lost, so I have no clue what it is.

Jeri

Most days the fog burns off by about 9am and so it does get about 4-5 hours of sunlight, probably more than half of the time. The problem with fuchsias or other more tender shade plants is that on the hot (100+) days the garage bakes for those entire 4-5 hours and I'm afraid they would suffer and/or die. I have some pics of the garage and the morning glories and other annuals I have planted, they are growing - just slowly.
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So after 11 years how is your zephrene droufin? I’m about to plant one myself. I’ve read they do fine with minimal sun.