 Boise National Forest is directed by the U.S. Forest Service to " control the establishment , spread , or invasion of non @-@ indigenous plant species in otherwise healthy native <unk> ecosystems . " The forest 's plan addresses the need to control invasive plants , and management efforts include chemical , mechanical , and biological control methods . Invasive plants that are of particular concern in Boise National Forest include spotted <unk> , yellow star @-@ <unk> , rush <unk> , and leafy <unk> , among others . 
