invasive plant

Asked April 18, 2013, 4:20 PM EDT

Have a huge, fast growing, fast spreading plant (weed) I can't get rid of. I'm not sure what it is but in looking through my books I think it might be Knotweed,Japanese. We have use roundup. Do you have any suggestions. It is going into the neighbors yard also. It seems like there is no stopping it.

Dauphin County Pennsylvania

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