I had to look this one up - the rhizomes form dense stands to 1.5m across and the main stems grow up to 8' tall! They like open positions in full sun and acid to neutral soil and they're hardy to about -5°C.

Your pot therefore will soon be far too small, and you'll need to pot it on as soon as possible, and then make a judgement as to whether it will survive a winter outside in your area.

In their native S Africa they like very moist conditions too.