The vegetation of the Vall de Llémena is heavily conditioned by the varying climatic conditions: on the Sant Gregori plain there are typically Mediterranean woods, with a strong presence of stone pines (Pinus pinea) and the cork oak (Quercus suber).
The shrubby undergrowth in these woods is made up of common box (Buxus sempervirens) and various aromatic plants. On the banks of the intermittent Llémena stream, there are planes and some black poplars (Populus nigra). Furthermore, the variety of species in these riverside environments is very high: we can find narrow-leafed ashes, (Fraxinus angustifolia), elms (Ulmus minor), field maples (Acer campestre) and several hazels (Corylus avellana).
As you travel upstream and gain altitude, there is a visible difference in the landscape: trees from colder and more humid climates begin to appear, such as the downy oak (Quercus pubescens) and chestnuts (Castanea sativa). The stone pine is replaced with the Aleppo pine (Pinus halepensis) and the cork oak gives way to the holm oak (Quercus ilex).