Is knotweed invasive where you are?
Some knotweeds are but not this one. It's dyer's knotweed, polygonum tinctorium or Japanese indigo. In fact I think it doesn't like the local climate much... unfortunately.
eva--i grew dyer's knotweed in our short summer, and it flourished. just not for very long. maybe it will be fine if it can get enough sunshine.
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