Two neighbours in south Wales sued Network Rail over plant encroaching on their land
The world's largest field trial on the control of Japanese knotweed, conducted in Wales, has found that eradicating the plant is not possible.
An industry group is advising agents and landlords to be vigilant against a problem that has been stopping vendors selling their homes - the rise of Japanese Knotweed.
Gardeners searching the web for advice on the best way to tackle Japanese knotweed are likely to find confusing and contradictory advice, a study says.
Researchers found the accuracy of information varied significantly, and could result in the further spread of the non-native invasive plant.
Japanese knotweed is one of the most damaging invasive species, estimated to cost £166 million each year.
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