Here are some general rules that will help you make your cut-flower arrangements last:
Don't overcrowd the flowers in the container.
Check the water level in the vase and replenish it frequently.
Flowers that go limp are not drinking well and need to be recut.
Always discard wilted blooms.
Keep flowers away from drafts, direct sunlight, and ripening fruits, which emit ethylene gas—a substance that causes buds to remain closed, petals to have poor color, and flowers to have a shortened vase life.