This was taken locally from an area that has been cleared in preparation for the building of a community centre. As this photo shows, the olives are tough old trees and they only have about 30cm's of earth and then its rock. Yet they flourish in these conditions. This was a valuable trait as this meant the better lowlands could be used for more valuable crops but the lower hills slopes could still be put to olives.
Nowadays olives are grown in fertile soil and are irrigated etc etc. I don't believe this increases the quality of the oil that the trees produce but solely the yield of the trees.
Casa Margherita does not irrigate it's trees and they grow on the same hillside as the trees in the photo.
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