It is an opportunist, found in a wide range of soil types and precipitation zones. Distribution - BLM Prineville Dist. John Day River, and Deschutes River Canyons are highly susceptible to increased invasion. Very High via seeds and broken wind blown vegetative parts, vehicles and livestock, recreationists. ODA approved biological agents have been released in the Prineville District.
Manual control can be effective on new infestations which are small in size.
2,4-D, Dicamba, Picloram all have excellent control effectiveness. Glyphosate has insufficient data to determine effectiveness.