Posted: 09/08/2014 at 13:27
Looks like a Yucca but may be a cordyline or phormium. No matter which, maintenance is easy - none! Well, you should to remove dead leaves from the bottom.
Unfortunately there is no way to control their size other than by removal and replacement. If you trim the leaves shorter they will look awful and slowly die back from the point where you cut the tips off, so avoid that at all costs.
Sometimes they throw off side shoots or suckers appear close to the base and these can be rooted and used to replace the mother plant when it is removed.