Where you live, 'slightly exposed' might mean pretty cold in winter, so you may need to lag the pot to keep it from freezing in cold spells, and possibly remove to shelter in a really severe winter - bamboos can be a bit more vulnerable in pots to the cold. This link has lots of info re growing in pots, with some varieties to consider listed towards the bottom http://www.50connect.co.uk/articles/bamboos-in-containers