Had these for years but they have never seeded themselves, as most things do in our garden, if they can get away with it. I have split my original one in my garden twice. Never tried to grow them from seed as splitting easy. However it is not a good 'doer' in my soil.

yes you can but leave the seeds to fully develop and when the pod shows signs of drying out then pick the seed heads and leave in a paper bag or envelope until the seed drops out.