The government has launched a plan aimed at raising awareness of aquatic plants that can harm natural flora. Floating pennywort, water primrose and water fern are commonly used as an enhancement to garden ponds. But if they are disposed of in the wrong way, they can quite literally choke the life out of rivers, streams and ponds in the wild. BBC environment correspondent Sarah Mukherjee reports from the river Wandle in Morden in south London.
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