Polygonum orientale question

>You bet!  Kiss-me-over-the-garden gate is an annual here in zone 7.  We grew
>this from seed last year, and by the end of the summer it had become like a
>shrub, about 6' tall and 3-4' around.  Bloomed all summer until frost and had
>the most beautiful graceful pink blooms you can imagine.  A prized plant as
>far as I am concerned!
>

OK folks - I searched the web, found a great picture, (it is attractive)
and now I have to ask:  Here in WA state, we have an EXTREMELY invasive
Polygonum cuspidatum - the Japanese knotweed - and while it has its moments
of splendor, it takes over like kudzu must in other parts of the world and
it leaves a horrendous mess as it stages its rampage.  Any danger of P.
orientale behaving in such a manner?

Thanks

Vicki


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