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Wild flowers are being out-competed by ‘thug’ plants on our roadside verges, a study by the charity Plantlife has found. Pollution from cars and poor management practices by local councils has meant that nitrogen-loving plants out-compete wildflowers. Dr Trevor Dines explains to Adam Rutherford what actions can be taken to help our verges regain their natural biodiversity. First broadcast on Â鶹Éç Inside Science, 17 May 2018.