My two bobs worth:
I'm with TashPaul, put some nice oebbles or river rocks down and then some pots. You could use tall skinny pots & plant them with cordylines, or ginger, or something similar and underplanted with annuals like petunias or a creeper.
Alternatively, long narrow pots with lattice attached that you can climbers on.
I wouldn't plant anything into the ground or grow up against the wall.
I would however put a 13mm black polypipe retic line to that spot so that you can water your plants - potted or otherwise - at the same time as the rest of the garden.