I think you would be well served by spending some times browsing the posts in our 'greening the desert' forum
https://permies.com/f/121/desert That's some pretty extreme desert, so I don't know if the
thread where one of our members is planting a food forest from seed in Greece would be relevant or not.
There are also threads discussing desert plants/trees and ways of capturing rain water, dew, and fog in the side bar of best topics. Look to the right of the screen for these. Feel free to revive any topic you find interesting. Continuing the discussion helps bring new information in, rather than just recycling the few most well known facts.
edit: punctuation