Canna x generalis 'Stuttgart' people say they burn if planted in sun so they put them in shade.. I am waiting on my order for this year, so i have no experience on them.. http://davesgarden.com/guides/pf/go/37576/
I Have a large quantity of Cleopatra canna...They get morning sun only. The rest of the day they are in solid shade right up against my house. They keep coming back. Right now about 50 blooms and tons of new growth.