On the other hand your flowers also love water too. Now the problem is this. When you receive or buy that lovely vase arrangement, the flowers will gradually suck water out of the foam. So it is a good idea to check your foam every day or so to make sure that the foam doesn't dry out. Generally you can add a little water to the foam every couple of days.
Roses are one of the most popular flowers in America, but they are a very sensitive flower.
If you catch it quickly enough, there are some steps that you can try that may help to revive the flower. Lay the flowers flat on the surface of the water and let them float there for an hour or so. In many cases that will revive the flowers. If you find that you are consistently having problems with roses that you buy from a particular source, let the vendor know about it. Most quality florists want you to be happy.