Looks like it's a rhubarb

I was thinking that too at first ziyouzizai, but the stems are hollow...

You are correct it's burdnock. It will spread everywhere if it goes to seed. Wish all my burdock was rhubarb, I'd be making a lot of pies, yum.

Yes, no question this is Arctium and not Rheum.

Yes, nice, healthy looking Burdock. You can eat it Newbie. "Burdock achieved international recognition for its culinary use due to the increasing popularity of the macrobiotic diet, which advocates its consumption. " https://en.wikipedia.org/wiki/Arctium#Food_and_drink

Absolutely burdock.

Thanks all!