Yes, it is invasive if not kept contained. This is what I found about it:
http://www.cabi.org/BIOSCIENCE/japanese_knotweed_alliance.htm
I looked it up, as I've never heard of the name before, but as soon as I'd seen a picture of it, I realize I am well familiar with this plant. It has been growing at the side of the house and barn at my childhood home ever since I can remember. It grew like a little forest! Mind you, as a child we had loads of fun in those 'forests'. We always called it bamboo, tho I knew it wasn't real bamboo. Now I know it's real name. In recent years, my mother has tried to get rid of it by hacking it down every spring, and each time it sprouted, and it's worked for the most part, but stragglers are now invading inside of the garage and the barn with shoots popping through the concrete...any crack it can find, and there it is. So yes, I'd say it's invasive. As for containment, I'd plant it in a container, making sure there were no holes where the rhizomes could escape from and keep a close eye on it. The website I found has alot of good information on it, and it's a good read. Good Luck.
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