Answer: Under the circumstances, I think I'd recommend Akebia, honeysuckle or grapes. All would prefer at least half day sunshine, but all will grow in the area you describe. Instead of expecting the stems to cling to the stones and mortar, plan on stringing fishing line or galvanized wire from ground to roof to support the vines. Your plants will need good air circulation to help prevent diseases and providing air space between the stones and the vines will keep the stones clean. Hope one of the above plants provides just the look you want.
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