It seems that onion flowers don't have seed heads but the seeds develop lower down.

Because a lot of the stems had leaned over the path I stripped the little 'miniature' onions and scattered them across the borders. Now I must wait until next year to see what will happen. Will I have a show of flowers? I wonder.
It is surprising how attractive the flower heads are when viewed at full size by clicking with the mouse when looking at the blog.