The Dwarf Cavendish Banana makes a good container specimen if given careful attention. Banana plants are extremely decorative, ranking next to palm trees for the tropical feeling they lend to the landscape.
In general, Heliconias are evergreen in the Tropics and warm Subtropics, like zone 10. Further north, upper zone 9 and lower zone 8, they may be frozen back to the ground each Winter but survive to resprout the next Spring.