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The Infamous Five

1. Floating Pennywort. © GBNNSS - >> Next: Here's what it can do... >>

Fancy a swim? A sheep struggles through a morass of Floating Pennywort. © Trevor Renals ->> Next: Water Fern ->>

2. Water fern. © GBNNSS ->> Next: An example of its damage...->>

Troubled waters: boats sit in a waterway clogged with rampant Water Fern. © GBNNSS ->> Next: Water Primrose ->>

3. Water primrose. © GBNNSS ->> Next: What it does... ->>

Water primrose invading a lake © GBNNSS. ->> Next: New Zealand Pygmyweed... ->>

4. New Zealand pigmyweed (also known as Australian stonecrop) © GBNNSS. ->> Next: What happens when it gets into the wild... ->>

New Zealand pigmyweed choking other vegetation. Having not evolved alongside it, native plants cannot compete. © GBNNSS ->> Next: Parrot's Feather... ->>

5. Parrot's Feather. © GBNNSS ->> Next: What happens when it gets in a river... ->>

Where once there was a river, there is now a stream of green. Stopping the likes of Parrot's Feather from being sold to unsuspecting gardeners could prevent scenes like this. © GBNNSS

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As of 1 April 2014, five non-native and invasive aquatic plants were banned from sale in England - something Plantlife had long campaigned for. Background image © Trevor Renals.