Many spring-flowering bulbs, including tulips and daffodils, make
excellent cut flowers. Stems should be cut as soon as the buds
show color. The flowers will open in a day or two and remain in
good condition for about a week, sometimes more.
Before combining tulips and daffodils in the same arrangement, keep
them in separate vases for 24 hours. The sap from freshly cut
daffodils can reduce the vase life of tulips.
Note: If you cut flowers from a bulb that you want
to grow and bloom again next year, cut only the flower stem (in the
case of tulips, it's fine to take one leaf so you can get a stem of
reasonable length). The leaves need to stay attached to the bulb so
that it can store up the energy needed to make the next spring's blooms.