I have a large area of bushes, which I've chopped down with a brush cutter. I'm now left with the roots and stubble. The trunks of the bushes were up to an inch thick, and there are lots clumped together in places. What's the easiest way to get rid of it all so I can plant a lawn? I know there's "roundup root killer", but presumably it would take years to rot afterwards. I know there's a thing called a stump grinder I could hire, but all the ones I've seen around here have a vertical blade which doesn't look like it's suited to cutting lots of roots, more for a big stump. I was looking for a machine like the one in method 2 of 4, he http://www.wikihow.com/Remove-Tree-Stumps