Roses and lilies

As my own vegetable garden is not working so well I am starting to think about a flower garden. There is not a lot of light down where my garden is, nestled between '30s townhouses, but I cannot influence that, just how I cannot influence the cold and the rains from the past months. I am giving my veggies one last try to appear and I am changing things starting this autumn and will grow flowers and grass and maybe keep just a small patch for a couple of tomatoes and some lettuce. I'd like to plant roses but I have so many ideas. I hope I will also have the time to do all that.