My aunt just got a big pot of it and we don't know what is.
Thanks in advance.
Hi there! Looks like horsetail! Heheh, sorry! It's a look-a-like ~ not actually bamboo!
Although pretty and looking somewhat like bamboo to the casual observer, it is Scouring Rush Horsetail, and it can be highly invasive, and very difficult to eradicate. If you like this stuff, proceed with care...
You may wish to read this GardenWeb posting about this plant:
Here is a link that might be useful: Scouring Rush Horsetail