never had good luck with any of that (tried it all). HOWEVER, did have really good luck by taking the entire pot of soil in which the plant was given you, and , just as the flowers are fading. PUT the entire pot into a BIGGER pot with new soil. ALLIUMS are voracious feeders in pots and will more often than not, die.
We often go to the town cemetary compost site . AFter Easter or other holidays where people dress up their family graves with flowers, the grounds crews give em a week and then haul them to their compost pile. We ask the guys whether we can have any daffodils and hyacinths (these are great for naturalizing).
We always buy flowers for the house and a few days after Easter, the whole soil mass goes into the garden. Weve got daffodils and masses of hyacinths that are 25 years old.
Remember that most all alliums need to be stratified (Chilled) between the seasons, so dont bring the pot in and just store it in the basement with no water, (Itll still give out). Id "overpot it" like I said an store it in the garage or in a shed. You want to have several days of frozen soil (Tulips dont do well in the south, clay soils AND not much chilling in the soil)
Daffodils cant be killed.