Quote:
Originally Posted by mudcow007
the weeds/ plants are tubular (you can crush the stem between you thumb an finger) and hollow, the stem is green with red flecks like knotweed, the leaves are more pointed than all the other knotweeds i have seen. one thing to note is that on all of the leaves there is a black spot in the centre of all the leaves
most of the plants seem to coming into flower, with red tiny flowers not yet open
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Japanese knotweed has creamy white flowers, though I haven't been able to work out if they might look red when still in bud.
Still the black spot in the centre of the leaf makes this sounds a lot more like Persicaria maculosa, which is noted for having a black spot in the centre of the leaf. Though it is a rather smaller plant than J knotweed.