There used to be a
seed identification website. I can't remember the name but I'm sure someone can. What I remember about mum
seeds is that they have a stripe down the center of the
seed. I also remember that getting germination was extremely hard for me. But then my thumbs are brown.
For me the easiest way to propigate mums is to divide them in
spring when it is time to move them every 3 years.