There are a few simple rules to follow when taking care of cut flowers. Whether you are buying them from a florist or cutting them from your own garden, these guidelines will help to keep them fresh.
When choosing flowers, select those that are just short of their prime.
Place the stems in warm water immediately.
Keeping the stem under water, use a sharp knife to cut off about 2 inches diagonally from the bottom. This will allow the stem to be sealed with water, and prevent it from resting on the bottom of the vase.
Use a clean vase to prevent the spread of any bacteria.
Use lukewarm water for most flowers. Tulips and other spring bulbs prefer cool water.
Add flower food, following the instructions on the package.
Remove any leaves that are below the level of the water.
Some flowers take up more water than others. Check the water level frequently.
Change the water and re-cut the stems if it becomes cloudy.
Keep them away from direct sunlight or other sources of heat or cold (hot air registers, fans, televisions etc.)
Remove dying flowers.
Daffodils don't mix well with other flowers. They can be added later if you have kept them in a separate container of water for a day.