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Polygonum cuspidatum.

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Which plants should I avoid planting?

Polygonum cuspidatum.

Introduced as an herbaceous border plant during the late 19th Century. The triffid- like Japanese Knotweed with it's 6ft-8 ft tall hollow stems, heart shaped leaves and greenish white flowers now rates as one of the most pernicious weeds.
Still planted as an ornamental in eastern Europe.

   

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