Question
How can I tell the difference between a Stromanthe, and calathea tricolor?

Answer
I do not grow either of these, as I am far more focused on local wild plants, but from checking on line this is a question even experts disagree on. Here is a link to a very detailed discussion on another site on the subject: http://davesgarden.com/community/forums/t/932797/ Sorry not to be of more help on this one.