Introduction
The riera is a dry stream, carrying water only during heavy rainfall, which quickly infiltrates into the ground.
This means we do not find strict riparian vegetation, but trees that thrive nearby and appreciate cooler microenvironments. In forested areas, the pine and oak forests extend to the torrent and become more lush. Here we find elms and some probably planted poplars, such as the small ash next to the path. Where moisture is more stable, there are patches of reeds.
The elm grove is in good condition, despite native elms being affected by a disease that prevents them from living beyond 9 years: Dutch elm disease, caused by a fungus that enters the trunk with the help of a small beetle, eventually killing the tree.
In the mid-mountain region, elms have traditionally been used to form fences between pastures and their leaves have been used as livestock fodder (like ash trees).