For glaze firing each Allium needs to have a support in the kiln. It is a one-time use, because the support needs to shrink the same amount as the piece of work.
To avoid the Alliums from rattling around on the metal support they are filled with builders-foam. To do that each of them is tightly wrapped into cling-film, a straw is being put into the “stem” (so the air can get out) and it is then filled with expanding builders-foam.
After hardening the excess foam is cut off and a hole is drilled. The stem of the Alliums is made of stainless steel, which is either an individual spike or can be mounted on a wooden base for multiple flower-heads.
These Alliums are frostproof and give colour in your borders all year round!