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© 2008 Clackamas River Basin Council |
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Bioinvasions Invasive species in the Pacific Northwest Invasive species are plants or animals that are not historically native and cause detrimental economic or environmental impact. Invasive weeds aggressively invade an area, out-competing native plants to create monocultures. They are able to do so because they grow very quickly, have no natural predators, can rapidly reproduce, and can tolerate disturbed environmental conditions. Often before an area can be planted with native trees and shrubs, invasive weeds must first be removed. Examples of invasive weeds include:Himalayan blackberry, English Ivy, Scotch Broom, False Brome, Japanese knotweed, and Reed Canarygrass. For more information on Oregon Invasive species click here. |
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