Olive cultivation

On the left, there is a group of olive trees which have a very clear difference from typical olive groves. Do you know what it is? If you said the grasses and bushes surrounding them, you are right. This is an old olive grove which was abandoned a few years ago. This can be seen in the mass of plants surrounding and even covering the olive trees. This would never be found in an active field of olive trees, as the other plants would take resources away from the olive trees which would lead to lower olive yields and could kill the olive tree. If you walk 15 metres uphill, on the right you will see a typical field of olive trees with bare earth: olive trees and nothing else.