Hard Ground

This weekend I decided to plant some rose bushes in my new back yard. I got six bushes in different colors and sizes. I think my house was built on a river bed. There are so many rocks in that ground that I couldn't even use a shovel I had to use one of those hand gardening shovels. It took over an hour for each hole, but I did get them all in so ya for me. It made my hands and arms so sore I'm chicken peck'n it right now. I'm going to have to come up with something else to finish planting things in my yard. Dose anyone have any ideas or know of a tool that might help please let me know.