I can see that I need to move some things yesterday, if I want them to survive. As they age, the flowers lose their distinct lines and eventually drop their petals, carpeting the soil under the plants in pink snow. Supposedly narrow seedpods develop - haven't seen these yet. They are native to grassy places and scrub in sun and require a fairly light, well drained soil that does not dry out, in part shade to full sun to thrive. My plant is in a raised bed, backed by a stone wall and receives maybe two to three hours of late morning sun.
Germination can be variable.
Cuttings of half-ripe wood, preferably with a heel, taken in late summer should root fairly well. Again, the young plants need to be overwintered under cover. Root cuttings taken in December should also work. Supposedly these plants sucker to form many stemmed clumps. I haven't seen this trait, yet.