It is a common misconception that roses do not do well in water. In fact, most rose varieties do very well in this environment and, with the right care, will flower abundantly.
Don't be dissuaded by the idea that roses are very hard to grow. They're like a lot of other flowers, and as long as you attend to their various needs you're sure to see wonders when their time comes to bloom.
If you really want to make them as healthy as possible, you're strongly encouraged to grow them inside a greenhouse. This way you can really control everything so that they don't receive any damaging effects-