Oaks and pines live here together. They replace the ancient hay meadows once maintained by the inhabitants of Réallon. The pine forest consists of Black Pines and some Scots Pines. The Austrian Black Pine has long, rigid, prickly dark green needles; those of the Scots Pine are short, twisted and bluish green. Due to its hardiness, The Austrian Black Pine was introduced in the 19th century and was often used to restore the eroded soil of the Southern mountains. This was the case on the « sunny » (Southern slope) at Réallon where it was planted by the Mountain Restoration Service at the beginning of the 20th century to stabilize the slopes and to protect the village and the road.