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Japanese knotweed

By: Garden Gate staff
This extremely invasive weed has simple medium-green leaves and spike-shaped pale-green to white flowers in summer.

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Japanese knotweed Polygonum cuspidatum

IDENTIFICATION — This extremely invasive weed has simple medium-green leaves and spike-shaped pale-green to white flowers in summer. By the end of summer the plant can reach to 8 ft. tall.

FAVORITE CONDITIONS — Japanese knotweed spreads by rhizomes in full sun and dry soil. Cultivated areas, such as garden beds, and waste areas are where you’ll find this pest.

CONTROL — Use a nonselective herbicide like Roundup® as the plant is starting to go dormant in early fall.

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