It's a pain. Seed is large (size of a small hat pin head), black, round and shiny. one sometimes
two seeds per capsule is produced, when ripe the seed rolls out onto the ground- best to get on
ones hands and knees and collect the seeds off the ground in early summer, helps to use an old,
thin layered shirt placed under the plants to collect the seeds, if you have to collect seed.
Otherwise let the seeds germinate under the mother plants next spring and move the seedlings
next summer.