Hi,
Is that a man's work ? - growing technique test ? as in growing technique against a wall, but at the roof ?
Was that tree planted like that on purposes or did she grow there ?
I don't see how that tree could get sun until being at least a meter in depth :) .
I would imagine there was once a tree over the bridge and she was cut down, thus forcing the tree to grow were she could.
I've seen figtrees growing on walls because of that, but on an arch, I had never seen that ... The photo is not photoshoped as all the leaves are growing in the direction to the sun .
Funny, the tree could grow in a round shape as the leaves behind -leaves growing to the rear wall- don't get direct light ...
Does the tree fruit ?
As for nutrients and water, it is obvious that the tree is fed from above - So just lay the manure and throw water on the bridge so to say on the tree :).
I have already written in the forum that my figtrees like to get the stems and leaves watered - not only the roots - that tree for sure gets her stems watered as the water will flow from roof to the ground.
Nice find !