The majority of the area of the Dyfi Hills was planted with forests by the Forestry Commission. Planting started in 1926, and huge areas of land were purchased between the Wars and into the 1950s and 1960s. The trees planted were mainly Sitka Spruce and Japanese Larch, though a large number of other species were also tried. The trees are regularly felled for commercial use and replanted. This forested area forms the major part of the Dyfi Forest.