If I remember correctly the 'Tropicana' does not produce usable seeds, and if it does they are few and far between. I think the female part is almost always sterile. Let me check my rhizomes and see what I can do for you. If I have any extra I will drop you a line. Sorry.
Joe

Joanne, I've been growing Trops since they were first introduced and I've never seen any seeds produced by any them.

Your best bet would to be to get rhizomes and go from there. They spread rapidly and reliably so in no time you'll have quite a clump that can be divided and planted in other spots.

With Spring on it's way, places like WalMart, Home Depot, and Lowe's will start carrying them before too long, at least here in California. You can also order them online from various sources.

Jenna