Judith in England wrote:

Any ideas on how they are produced commercially?

IIRC, the inbred parent lines have at least the female parent with sterile
pollen, so only the _other_ parent can pollinate it and produce seed. I
believe some are still done by hand pollination; these are the really
pricey ones!
I haven't worried too much about all that, because I don't demand absolute
uniformity in the crop or harvest time, and I save my own seeds wherever I
can.


--
Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic
Zone 5/4 in upstate New York, 1420' elevation. NY WO G