Search results
Results from the WOW.Com Content Network
Common ragweed, Ambrosia artemisiifolia, is a widespread invasive species, and can become a noxious weed, that has naturalized in Europe; temperate Asia and the Indian subcontinent; temperate northern and southern Africa and Macaronesia; Oceania in Australia, New Zealand, and Hawaii; and Southwestern North America in California and the ...
[2] [3] [4] It is considered to be one of the ten worst weeds in the world. [5] In the United States, Johnson grass is listed as either a noxious or quarantined weed in 19 states. [ 6 ] With Sorghum bicolor it is a parent of Sorghum × almum , a forage crop also considered a weed in places.
A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is harmful to agricultural or horticultural crops, natural habitats or ecosystems, or humans or livestock. Most noxious weeds have been introduced into an ecosystem by ignorance, mismanagement, or ...
The Federal Noxious Weed Act of 1974 ("FNWA", Pub. L. 93–629, 88 Stat. 2148, enacted January 3, 1975) established a federal program to control the spread of noxious weeds. The United States Secretary of Agriculture was given the authority to declare plants "noxious weeds", and limit the interstate spread of such plants without a permit.
In the US, hogweed is regulated as a federal noxious weed, and is illegal to import into the US or move interstate without a permit from the Department of Agriculture (USDA). [32] The New York State Department of Environmental Conservation has had an active program to control giant hogweed since 2008. [33]
The plant can be found growing in hedges and waste places, limestone scree and as a garden weed. [21] [22] G. aparine prefers moist soils and can exist in areas with poor drainage. It reportedly flourishes in heavy soils with above-average nitrogen and phosphorus content, and prefers soils with a pH value between 5.5 and 8.0.
Dittrichia graveolens, commonly known as stinkwort [2] or stinking fleabane, [3] is a plant species in the sunflower family, native to southern Europe, [4] North Africa, and western Asia as far east as Pakistan.
It is capable of spreading and thereby becoming an invasive weed. All parts of the plant are toxic , especially the seeds and roots, and especially when ingested. Under the right conditions the plant grows quite rapidly during the growing season and can reach heights of 2.4 metres (8 feet), with a long penetrating root .