I think it's "what you see is what you get" with bract color on a "boogie". At least it is in my area.
Do you have any gardening reference books? Here's a link to a good one. You can find it most book stores and online of course. It's a great resource for us western gardeners.

Here is a link that might be useful: Sunset Western Garden Book

I agree with nmgirl - there are different varieties that have different colored bracts - what you see is how it will always be.