It is so tempting to want to grab a handful of spring flowers and plop them into a flower vase to enjoy inside. You can do so but you need to let the daffodils sit in water for at least a day first to remove toxins that kill other flowers.
Once daffodils have been cleansed, you can easily add tulips and other spring flowers.
If you don't have time to let the daffodils remove the toxins, put only daffodils in the bouquet or the toxins will wilt the other flowers.
It doesn't take long to do and is well worth the extra effort.