Creeper / vine for railing

[Lazyi]

Hello there,
I'm a novice gardener looking for some advice please. We have a lower basement patio, with a railing around the top at ground level, about a meter high. It looks quite harsh at the moment, and I'm looking for something to soften it up a bit. I think I will probably use the boxes that straddle the top of the railings, or a balcony box, that hangs off the railings.
I don't want something that's too messy, that I would have to clean off lots of leaves, and ideally I'd want something evergreen, or at least something with leaves a lot of the year, and perhaps some flowers too. I was wondering about a grape vine, but that might be silly. Do I need a "creeper", rather than a climber? Do climbers just go up? I need something that will grow along.

Any help much appreciated!

Don't use a grape vine, they grow like monsters and require regular pruning if you are hoping for any fruit from them.

Clematis armandii is an evergreen climber which twines around supports and has white flowers in the early spring. However it wouldn't be happy in a balcony box, it would need more soil and moisture than that so I would recommend buying a large pot to put it in and keeping it well watered.

If you have to stick to the balcony boxes then why not try some annual plants just for the summer? Trailing lobelia and trailing petunias are great for filling up spaces quickly and they are available cheaply at the moment.