Japanese Knotweed (Reynoutria japonica)
Tall, vigorous and often forming dense thickets; stems somewhat zigzag. Leaves broad triangular. Flowers whitish, in branched clusters; August-October.

If left untamed, this plant can take over large areas and is notoriously difficult to remove. One large patch in far meadow.

Spotters' score: 3

ref: p.42/2

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Japanese Knotweed