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<p>We are aware that Japanese knotweed is widespread across many parts of the world;
recent information (from the CABI Compendium, part funded by Defra) suggests it is
found in 35 countries outside its native range. Following its introduction to the
UK in the early 1800s, Japanese knotweed was first recorded in the wild in 1886. Its
initial spread was slow. By 1930 it was present in 73 hectads (i.e. 10km x 10km squares)
in the British Isles; by 1986 it had spread to 948 hectads and it is now present in
approximately 2,879 hectads.</p><p> </p>
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