They can be grown from seed and will increase by bulblets growing on the sides of the original bulbs. These can be removed and re-potted to grow on. Monty Don (G. world) was cutting off his Camassia seed heads, so I don't know if this takes goodness from the bulb itself, or if he was being tidy! I don't dead-head mine and they seem to have increased, whether from seeding or bulbs I don't know. You can always type in 'growing camassia from seed' in your search engine and you will get lots of help - and cookies!

It will probably take about 2-4 years for the seedlings to bloom, and they will come out all different heights and shades of blue, unless the seeds came from a natural species, rather than a hybrid.

Yes, it was watching Monty dead head his Camassias which prompted my question.
I bought one the other week, and when I took it out of the pot, it naturally came apart into three plants, so that was a bonus. It had a flower on it which was on the wane, and so I cut it off, and wondered if I could sow the seeds. I did google “Grow Camassias from seed” but there was very little info.

Here's hoping that the seed is ripe. Until the capsules start to turn color and crack open on the plant, the seed may not be mature enough to sprout.