Hi Colleen, I might be able to help. I to have researched sweet Grass until I`m nearly going grean.Anyway i finally got a plug of
Sweet Grass given to me. The lady that gave it to me said they have no flowers ( internet said they did) She did say they have seed heads. One way you can tell is Sweet Grass is flat. If you smell it you will be able to tell. I can smell this stuff my husband swears a mile away but could never find it.
I have just planted mine so it doesn`t look to good right now
so not sure a picture of it would help you
Anyway i hope this helped you, and good luck with your Sweet Grass. You can e-mail me if you like