When you receive your bouquet, take paper out and give your stems a 45 degree cut
Fresh Cold Water
Place the stems in cold water. Make sure there are no leaves in water. Change it every day, wash the vase and always cut the stems a little bit before placing it back.
It shouldn't be too tight or too tall. If the vase allows, cut the flower tape off to loosen up the stems, so they have more space and air around.
Don't place flower under direct sunlight, close to heating areas and fruits.
Unless you buy a bunch of the same flower, your blooms will age with different speed. If you notice some of the flowers getting tired, take it out from the vase and rearrange your bouquet to keep it fresh longer.