This perennial shrub produces lilac-like purple flowers in mid-to-late summer and grows very quickly, sometimes as tall as 10 feet. The green-to-blue gray leaves are narrow and pointed.
The butterfly bush is native to northwestern China and Japan and poses a great threat to our dryland meadows, open slopes, dunes and reforested sites. You’ll often see infestations along highways, railroad right-of-ways, industrial yards and in riparian areas throughout Western Oregon. The best way to get rid of it is to cut it down and dig out the entire root system.