Washington State Noxious Weed Control Board Monitor List
Many noxious weeds are, in fact, escaped garden plants. Some escaped plants are temporary wanderers outside our care and nurturing, some only occupy niches where nothing else wants to grow. Some, however, become ecological bullies, crowd out native plants, poison livestock, and damage local ecosystems.
Qualities of Common Ornamental Plants
Characteristics of Noxious Weeds
Have you seen any of these plants on a roadside, hillside, by a river or stream? Have you seen them in a ditch or forested area? Chances are pretty good that they have escaped cultivation.
We are currently monitoring for these species. If you spot an ESCAPED plant (not intentionally planted), please report using the form below.
|Arundo donax, also known as “Giant Reed”, is a tall, erect perennial grass. It can look a lot like a rather leafy bamboo, and grows to heights of 20-30 feet when established. It may have green or variegated leaves. Arundo spreads by underground rhizomes, forming dense stands. Where it has escaped cultivation (California and much of the southern United States), Arundo has developed large, difficult to control infestations, and is a very serious fire hazard.|
|Garlic Mustard, one of the
fastest spreading invaders in woodland habitats of North
America. Up to 3 feet tall with triangular to kidney shaped
leaves and small white flowers clustered at tops of stems. Roots
and new leaves smell like garlic in the spring.
Oregon Public Broadcasting Television Presentation:Invasive Species Rapid Response
|Cortaderia seloana, also known as “Pampas Grass”, has been a widely planted favorite in the Northwest for many years. Native to Brazil , Argentina and Chile , established plants are a common sight in neighborhood landscapes, its feathery, distinctive plumes reaching up to 20 feet in height. Until recent years, Pampas Grass seemed to be well-behaved in the Northwest, as they were almost exclusively female plants, grown from root divisions for their superior ornamental qualities. Now there are both male and female plants sold, grown from seedlings, which may have inadvertently had genetic traits inherited from an even more aggressive related invader known as “Jubata Grass”. Both Pampas Grass and Jubata Grass have escaped and infested large areas in some places in the United States , particularly California , smothering native plants and creating serious fire hazards due to the large amount of dead, dry material that is produced by plants every year.|
Please remember to report
plants in locations where they wouldn't have been
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