mysweetie, did you ever find the pentas seeds? You will find them in a funny looking cluster when the flowers die back. This cluster needs to turn brown and the tiny capsules need to open up so that the seed can escape through the opening. You'll need to clip them off with scissors, being careful not to turn it over until you get it into a container. As soon as you turn it over, some seeds should fall out. They are tiny and black.

Like petunia seeds you mean? Coz i've seen the flowers turn brown but never the seeds. Maybe not all pentas have seeds?

Sorry I haven't answered before now. I just now found this post again. How do you keep up with all of your posts in the site? I finally found a picture, sort of, of a seed head. Look above and to the right of the main flower head, you'll see some small round discs, those were under the flowers before the flowers on that head died. I've been trying to get a good pic with my camera, but I don't have a very good camera.

Here is a link that might be useful: {{gwi:1253809}}