Quote:
Originally Posted by Hedgecop
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It is a Fallopia [also known as Polygonum]. If it stop growing at the height in your photograph and produces red pokers, it is likely to be Polygonum amplexicaulis, which is a thug but relatively decorative and can be dealt with.
If it continues to grow to about 6 feet and has white flowers you have the dreaded Japanese knotweed.
If the former, you can dig it out relatively easily. If the latter, you have a problem.