The message
from "Janice" contains these words:

My ornamental alliums (giganteum, aflatunense Purple Sensation) have now
produced seeds. If I collect and sow these seeds, will they produce flowers
next year or will it be several years before they flower?

It will be several years before they build up to flowering size. I think
about four is likely to be the minmum, certainly so if they get the kind
of semi-neglect my pot-grown plants get.

Janet G