when I collected the seeds it wasn't possible to collect complete and closed seed pods. The seed pods must have been from the year before and where completely dry like the ones on your picture but mostly open. I could only pick seeds from the pods where they did not open totally and seeds where capt inside. It took me a lot of Yuccas to get around 50 seeds each. Actually I saw a few of them and they still germinate. Hopefully within a few years I will show pictures of the plants.