Im not sure of the name but I got some too from my friend. It looks nice but it is very invasive and will even spread into your lawn if you plant it in the ground. It can grow very large. Up to 8ft high with stalks close to an inch across. And the base will get bigger each year as new shoots comeup. I wouldnt plant it near your house as Ive heard stories of it wrecking the foundations. It would be best to keep it in a big pot, although I don't know how it would winter in the pot depending on where you live.
I dug out what I had after I found out and even still a year later I am constantly pulling out little shoots that came up from bits of the root that I missed.
Hope that helped a little anyways
