Published February 1953. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published January 1995. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published April 1943. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Revised August 1989. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published November 1942. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Himalayan blackberry (Rubus armeniacus, formerly Rubus discolor and Rubus procerus) is a European shrub that was introduced in the United States as a crop in the late 19th century. It escaped cultivation and has since invaded a variety of sites, including low-elevation streamside areas throughout the Pacific Northwest. Listed as...
Gorse is a spiny, evergreen shrub native to the Mediterranean region. It was introduced on the West Coast of the United States as an ornamental in the late 1800s. Gorse was first found in Oregon in Benton County in 1916. Gorse infestations are concentrated along the Oregon coast, particularly south...
Japanese and giant knotweeds were introduced to North America in the late 1800s as ornamentals but soon escaped into the wild. They are particularly invasive along streams, roadsides, and waste areas. Large, spreading patches of knotweed can completely dominate and displace native species in open sunlight. Erosion can increase on...
Knapweeds are a serious problem in Oregon because they vigorously invade disturbed or degraded sites and form dense populations that exclude native and desirable plant communities, causing economic and ecological losses. Their ability to spread rapidly by seeds and
roots makes control very difficult. Seeds can remain viable for 5...