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If you're in the UK, the following non-native (invasive) aquatic plants have been banned from sale:
Source: http://www.bbc.co.uk/news/science-environment-21232108
- Floating Pennywort (Hydrocotyle ranunculoides)
- Parrot's Feather (Myriophyllum aquaticum)
- New Zealand Pigmyweed also known as Australian Swamp stonecrop (Crassula helmsii)
- Water-primrose (Ludwigia grandiflora)
- Water fern (Azolla filiculoides)
Source: http://www.bbc.co.uk/news/science-environment-21232108