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I have some pink ones to. The seed are easy to collect. When the little pods dry just pop them open and there are the seed. They are black and I have good germation with mine. I dropped several in a pot and forgot what they were until they were around 4" tall and I recognized the leaves on them. I have the purple ones in several different places. I haven't tried the pink yet. I'll collect some of them this fall. They also transplant easy.
I never gather seeds, but they reseed all over the bed that they are in. The new plants are slow to show in the spring, and they do break off easily. Our resident deer nipped mine back just before they were ready to bloom, but they have bounced back and are loaded with blooms.
do they spread like a carpet or do they just pop up in really random spots like Cosmos?