We had a couple of trees removed last year, and since the landscapers basically threw in the tree removal with another job, they did not grind the stumps. One of the stumps is smack in the middle of the front yard, so I was thinking about hollowing it out to about 5-6" deep and planting annuals in it. I'm pretty handy and have a decent selection of hand/power tools, but I'm not sure what would be the best thing to use. Anybody got an idea better than a hammer and chisel?