Comments: Human actual threat: Habitat destruction is the primary problem. Example: An E. purpurea population at the U.S. Army, Fort Polk Military Reservation in Vernon Parish, Louisiana, existed along the edges of a glade that was partially destroyed by military training exercises in 1998 (K. McKeown, pers. obs. 1998). E. purpurea is listed in Louisiana where such glade habitats are rare.
Note that "purple coneflower" is also a common name for E. angustifolia var. angustifolia and reports of root digging of E. purpurea are most probably reports of digging of the former species. E. purpurea fortunately tends to be located in remote areas that would not be appealing to root diggers.
Natural actual threat: Succession is also a problem contributing to habitat destruction. One example of such succession is on private land where a locally rare population occurs in Madison Co., North Carolina. The human potential threat for wild root harvesting is low because the (remaining) populations of E. purpurea tend to presently occur in remote locations. (Southern Appalachian Species Viability Project 2002).