Undesirable plants that infest either land or water resources and cause physical and economic damage. Under the Federal Noxious Weeds Act of 1974, (P.L. 93-629, January 3, 1975), the Animal and Plant Health Inspection Service works to prevent noxious weeds from entering the country, and conducts cooperative control/eradication programs with the states. Local governments frequently impose taxes on landowners to carry out noxious weed control programs.
Aggressive, non-native plant species that have been introduced. They can be difficult to manage, poisonous, toxic, parasitic, or carrier of insects or disease. Examples of park noxious weeds would be yellow star thistle, spotted knapweed, bull thistle and Himalayan Blackberry.
plants considered to be a threat to human and animal health, agricultural production, and the environment, which by law must be managed
A group of weeds that harm cultivated plants by crowding them out.
Plant species designated as noxious weeds by the Secretary of Agriculture or by the responsible State official. These species are generally aggressive, difficult to manage, poisonous, toxic, parasitic, a carrier or host of serious insects or disease, and are nonnative, new, or uncommon to the United States.
any weed so designated by the Weed Control Regulations and identified on a regional district noxious weed control list.
An alien, introduced, or exotic undesirable species that is aggressive and overly competitive with more desirable native species.
Any grass or forb, usually designated as harmful to livestock, farm crops or other useful plants.
A legal definition of by the State of Washington that lists specific non-native, invasive plants known to destroy habitat for other plants or animals, or documented as having caused serious agricultural problems. A list of names is published each year by the Department of Ecology which lists the level of threat posed by the plants and the legal responsibilities of owners who find them growing on their properties. Individual counties may modify the list to fit specific distributions within the county. King County Noxious Weed Control Program
Weeds categorized by law as objectionable in a seed lot for commercial sale.
Noxious weeds are designated plants that have been harmfully introduced into a foreign ecosystem either by accident or mismanagement, resulting in the suppression of the native species of plants and animals of the area by a rapid rate of growth and high levels of adaptation and resistance to natural but typically adverse conditions. They are a presently a large problem in the western United States, greatly effecting areas of agriculture, forest management and other open lands; and are typically native to the eastern hemisphere. Some species of noxious weeds are toxic, and others destroy by imbibing all moisture from the soil or growing in height, choking out the other vegetation.