Oriental Black Bamboo

That sounds like a very, very small plant or else a pot that's far too small. I think it would take an awful long time - years, possibly, to get to a decent size, so I'd buy a larger plant, to be honest.

I would definitely keep it in a sheltered spot over the winter, possibly even in a cold frame or unheated greenhouse--true bamboos do terrible as house plants. Spritzhenry is right, though: a start that tiny will take several years to even get chest high. It may be frustrating, unless you like to watch little ones grow, like I do!