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Telegraph: British Waterways identified 12 speciesknown as the 'Dirty Dozen' that are suffocating plants and fishes in rivers and ponds across the country.
Most of the plants were introduced to the country from the far East as ornaments for people's gardens including floating pennywort, water fern, Japanese knotweed, giant hogweed, Australian swamp stonecrop and Himalayan balsam. But they are now pests that suck the oxygen out of ponds, drown out other plants and can even break up concrete.
Introduced......
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Dirty Dozen invasive species named
Posted by Telegraph: Louise Gray, on April 27th, 2011
Posted in Water Conservation