I do pretty well with plants unless they are high maintenance. Most of the plants I picked for my garden were rugged. When I was at Home Depot they recommended a knock out rose. The minute I heard "rose" I tuned out. I picture all the special fertilizers and food you have to give a rose and even then they can door poorly. I was told knock out roses are rugged and don't need to be pampered, so I gave them a try. I am impressed with how tough they are and how frequently they bloom. No black spots on the leaves or insects attacking them.
They are easy to grow, disease resistant and bloom a long time. If that wasn't good enough, they are reasonably priced. I bought the smallest container and the plants doubled in size quickly. I did give them a little plant food, but that was it as far as care.
If you want the beauty of roses without the hassle, these may be for you. I am very impressed with them.