They like ocher...

In a very limestone environment, the ocher massif of Luberon offers the vegetation a unique sandy substrate in which an outstanding procession of siliceous (growing on silica), acidophilous (growing on acid soil) and psammophilous (growing on sand) plants develops. At the heart of the maquis, lawns colonize small isolated clearings in which rare species took refuge, some of them being protected by law.