When it comes to gardening, I’m a fan of “easy”, although I think everyone’s definition of what that means can vary. Roses are sort of known for being determined growers, but often prone to disease. So depending on where you live and what your climate is like, you might have a hard time maintaining your roses while other folks can kill them if they try!
The following list includes some flowers I have grown successfully as annuals myself, and others that I am surprised to learn are easy to grow, like fuschia. If you would like to get some color in your garden with minimal effort, start here.