My B. grandiceps bloomed and now where the bloom was there is a nice seed pod.

I want to harvest the seeds and plant them to try to grow another plant.

WHen should I pick the pod?

I am not "Miss Seed" and don't have a lot of experience growing a lot of stuff from seeds. Should I just pick it now, or wait til the seed pod turns a darker color, or is there some sign I should look for?