Thanks for the photo which takes me back to my days in Cairo when I lived there for a couple of years from 1992-94. The nurseries were very much the same then as now judging by your photo. Often small areas along the banks of the nile and also situated in the shade utilising space under flyovers away from the river. Having no garden or balcony in those days I didn't have any plants except a few house plants and the odd pot of "rihan" i.e. basil which I would buy from my local nursery. It had smallish, almost mint-like leaves, with purplish stems and leaf stalks. Nothing like the basil I now grow in Rome but wonderfully aromatic all the same.
Don't be fooled by the selection of plants on sale in these small nurseries - Cairo is (or at least was) a surprisingly green city with each residential block having its own garden tended by the "boab" (caretaker) full of ornamental trees and shrubs. So, even if there are no active members in north Africa, there are gardens aplenty in Cairo and tree lined streets too.
Wonderful memories brought back by your photo. Thanks again