If you could mount some small eye bolts in the stones near the top to hang strings or wire from, you could have almost any climber/vine. Pole beans, sweet potatoes, cucurbits, climbing roses, or clematis come to mind.
What is your main objective - beauty, usefulness, or the bees? Do you prefer annual or perennial?
Weeds: because mother nature refuses to be your personal bitch. But this tiny ad is willing:
Switching from electric heat to a rocket mass heater reduces your carbon footprint as much as parking 7 cars