My Welsh customer was a commercial grower and told me he grew only 2,000 varieties of Daffs.
The "Bleach thing" is, when you have a bunch of cut flowers put a few drops of bleach in the water and it keeps the flowers for longer, as the bleach stops the bacteria forming in the water. This is something that Florist do. When I buy flowers from the guy in Calis who comes around the restaurants. I always add some bleach, as in a hot climate the water does not keep good for long without it