The grassland Boukendaal on the border of te Walloon region, which became part of the forest in 2015, is being planted with trees ans shrubs. The main tree species that is planted is pedunculate oak. There is also some wild cherry, hornbeam, small-leaved lime and white elm. As to the shrub, a broad belt of hawtorn, blacktorn, guelder-rose, cornelian cherry, alder bucktorn, wild crab apple, wild peer, dog-rose, briar rose, field maple and rowan is planted in the southern edge.