Yes I do grow the all my flowering size Brunsvigia,s in what is called the
PB 40's
Those large plastis bags are mainly used for growing on the larger size
bulbs commercially and to accomodate the large root system once established.
I start off with transplanting the 1 year old seedlings from the polystyrene
seed trays into smaller bags, ( 8-12 PB's) and as the bulbs grow
progressively bigger, I will transplant again in larger bags, ( 20-40 PB's)
eventually reaching the size (some species huge) where only one will occupy
that volume.