
The coussoul is a steppic pastoral lawn. Its rough vegetation grows on a very fine soil, which covers the pebbles coming from the old bed of the Durance. At less than one meter deep, there is a layer of pebbles cemented by a crust of mineral salts. Called "poudingue", it directly impacts the growth of trees. In Eyguières, there is little coussoul because the lawn has been replaced by crops, but we observe very well pebbles conducive to its development.