Georges Guende, who has studied the flora of the Luberon Natural Regional Park for nearly twenty years, has brought to light the specificity of the flora found in the ochre mountains.
If holm oak, white oak, Scotch pines, rosemary, thyme and boxwood grow indifferently in chalky or siliceous soil, there are other plants which are characteristic of ochre earth. Parasol pines have invaded these areas, following the deforestation that accompanied the opening of the quarries. More rare, the chestnut tree flourishes in the coolness at the bottom of the valleys. The undergrowth is made up of broom heather, which we used in olden days to make brooms, and the common heather produces, in Autumn, long, magnificent bunches of bright pink flowers in the form of small bells. In an open field, the heather takes over the soil, forming a dense tangle of shrub. Testifying to the air's purity but also the ambient humidity, the lichens attach themselves to the bark of trees on the most eastern hills. The aesthetes will particularly like the diversity of wild orchids; some twenty six varieties thrive here, some of them extremely rare. Nature lovers will be keen to admire and photograph them, without touching. The large number of visitors to these areas does, in effect, put these plants in danger of dying off.
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