Roses for Valentine's Day: If the flowers droop quickly, it's usually due to the wrong water. If roses hang their heads, this usually indicates stale or too cold water.
The wrong location can also be a cause. Roses don't like drafts. A place next to the fruit basket is also extremely bad for cut flowers, because the ripening gases from the fruit cause roses to wilt more quickly. It is best to renew the cut with every water change so that bacteria and other germs cannot affect the flower.