I have those too; although they are edible (to a point) they are primarily ornamental. They are good early bee plants, taking over just after the grape hyacinths have given up. IMO the flowers are delicious added to salads, sort of a honey-garlic flavor.
To collect chive seeds, gently shake the flower heads over a container. You could also clip the flower heads off the plant and drop them into a paper bag. Then fold over the top of the bag and shake it to release the chive seeds from the flower heads.I have a garlic chive plant that i love and have protected for over 4 years now because i jist cannot find another one anywhere.
Anywho, it has finaly matured and flowered and i NEEED to collect it's seeds so i can plant more. Does anyone know how to go about this ? And is there any special care i need to give the seeds prior to planting ?