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Darren Seah and his daughter, Natalie, clear Japanese knotweed at Long Beach, the heaviest infestation along the Potomac.

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Japanese Knotweed crowds out native growth along the Potomac

It is 6:15 a.m. as Kit Britton heads for the Donaldson Run trailhead where he will have a 45-minute hike to the Potomac River.

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