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Japanese knotweed
(Fallopia japonica)
Japanese knotweed © Laurie Campbell
A non-native invasive plant.
Japanese knotweed is one of the most pernicious weeds in the UK. It reproduces from tiny fragments and any soil contaminated with Japanese knotweed fragments must be disposed of at registered sites to prevent its spread.
This plant is one of the species we keep track of in our Wildflowers Count survey - click here to find out how you can help out.
Distribution
Throughout the UK.
Habitat
It can colonise most habitats, including river banks, woodlands, grasslands and coastal habitats.
What's the problem?
In 2003, the Government estimated that it would cost £1.56 billion to control this plant across the country.
Japanese knotweed is considered more of a problem in human-dominated environments such as urban areas and railway lines than in natural habitats. It grows through walls, tarmac and concrete and causes huge problems wherever it grows.
What are we doing about it?
Find out more about Plantlife's invasive plant programme by clicking here.