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Dense purple loosestrife stands can clog irrigation canals, degrade farmland, and reduce forage value of pastures. Dense stands also reduce water flow in ditches and the thick growth of purple loosestrife can impede boat travel.

Giant hogweed (Heracleum mantegazzianum) is often referred to as the UK's most dangerous plant, with its toxic sap that can cause life changing burns and blisters for those that come into contact with it.

Spotted knapweed is a native of Europe and Asia. It was introduced to North America in the 1890s as a contaminant in agricultural seed and through soil discarded from ship ballast.

Invasions of common buckthorn can harm the environment, as this invasive plant outcompetes native plants, reduces biodiversity, degrades the quality of wildlife habitat, and impacts a wide range of industries.

It is often found on roadsides, grasslands, open fields and disturbed areas. Impacts: It can displace native vegetation, and threaten wildlife habitat, biodiversity and available forage for wildlife and livestock. It is toxic to humans and the milky latex can cause skin irritation upon contact.

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