I tried to split a seed in two but there’s nothing inside the seeds. Looking at pictures by other people on the Internet it seems to be normal that the seeds split into two hollow halves. It would be interesting to do a germination test on these seeds and see if they’ll come alive. I didn’t like the smell or taste of fresh coriander so I was planning on grinding these seeds into powder and use it for cooking. I think I’ll reserve a couple for germination though.
When I get a spare moment one winters evening I’ll pick the good seeds of the stems and save the seeds for next year.