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Himalayan Balsam 
Himalayan Balsam is now widely established in other parts of the British Isles becoming an invasive species weed. The aggressive seed dispersal, coupled with high nectar production which attracts pollinaters, often allows the Himalayan Balsam to out-compete native plants. 
Japanese Knotweed 
In Europe the species is very successful and has been classified as an invasive species in several countries including the UK.  
Parrot's Feather 
Spreads very easily and has become an invasive species and a weed in many areas. 
Australian Swamp Stonecrop 
Also known as the crassula plant, this Australian species destroys pond life by spreading like a sponge over the water surface. 
Giant Hogweed 
A robust, bristly plant that has a coarse foliage and almost flat-topped flowerheads with larger petals round the edges. These broad flower heads attract many insects, especially the orange or brownish Soldier Beetle. 
Floating Pennywort 
Forms dense rafts and outcompetes native plant species. Reduced light levels below the rafts can cause die off of waterweeds and algae and reduce water oxygenation levels. 
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